Answers B and C are correct.

Web-slinging represents an alternative cost [CR 702.188a]. The mana value of a spell is determined solely by its mana cost and does not change if the spell is cast for a cost other than its mana cost or if the spell’s total cost is modified in any way [CR 202.3][CR 118.9c]. In this scenario, Spider-Man India has a mana value of 5, regardless of how much mana Alex spends to cast it, and Lurking Lizards’s ability triggers.

The effect of Madame Web’s ability grants Alex permission to cast the top card of their library if the resulting spell is a Spider or a noncreature spell. The permission has no other conditions, so Alex is free to pay the spell’s mana cost or any alternative cost available for that spell, such as web-slinging.

The creature Alex returns to their hand is not a target of the spell, so Mouse Trapper’s ability doesn’t trigger.

If Alex casts a spell using web-slinging, the spell’s total cost has two parts: paying mana and returning a tapped creature Alex controls to its owner’s hand. Alex can pay those two costs in any order [CR 601.2h]. In this scenario, they can first pay the mana (using convoke for some or all of it) and then pay the other cost by returning Peri Brown to their hand. Since Alex has paid the mana by that point, it does not matter that Spider-Man India loses convoke. Similarly, it does not matter that Peri Brown only becomes tapped right before Alex pays the second part, since they do not have to declare beforehand which creature they intend to return [CR 702.188a].

Abilities that trigger when a spell is cast trigger only upon completion of the casting process [CR 601.2i]. In this scenario, Alex returns Spider-Man India to their hand in the penultimate step of casting the other Spider-Man India, so Spider-Man India is not on the battlefield anymore when its ability would trigger.

Answers A, C, and D are correct.

Mayhem is a static ability whose effect continuously grants a permission to play the card with mayhem [CR 702.187b][CR 604.2]. That permission mentions a specific zone (the graveyard) and another condition (the card must have been discarded this turn), but it does not say when Amelia can cast Spider-Islanders. For this, she has to combine it with another permission. By default, Amelia may cast a creature spell anytime she has priority during her main phase while the stack is empty [CR 117.1a]. If she controls High Fae Trickster, she may also cast a creature spell anytime she has priority [CR 702.8a]. Either way, Amelia does not have to cast Spider-Islanders right after discarding it.

After Romantic Rendezvous has finished resolving und has been put into the graveyard, Amelia first puts the two triggered abilities onto the stack, then she receives priority [CR 117.3b][CR 117.5]. With the two abilities on the stack, she cannot cast Spider-Islanders at this point, and she cannot cast it before putting the abilities onto the stack, as she does not yet have priority at that moment. Once Amelia has resolved the two abilities and the stack is empty once again, she can cast Spider-Islanders if it is still in her graveyard at that point.

Amelia may also respond to the triggered abilities or to Magic Pot’s activated ability (should Ned activate it) and cast High Fae Trickster [CR 117.7]. After both players pass priority in succession, High Fae Trickster resolves and enters the battlefield [CR 117.4]. After that, Amelia gets priority and may respond a second time by casting Spider-Islanders [CR 117.3b]. Provided that there are no more actions by either player, Spider-Islanders resolves and enters the battlefield, then Magic Pot’s ability fails to resolve because its only target has become illegal, then one of Lyla’s abilities resolves, and finally, the other ability resolves.

Answer B is correct.

Mob Lookout’s ability has a target, so when the ability is supposed to resolve, that target’s legality is checked; if the target is not legal at that time, the ability does not resolve and none of its effects happen [CR 608.2b]. In this scenario, the target, Prowler, has left the battlefield, so Mob Lookout’s ability won’t resolve and it won’t instruct Prowler to connive.

Prowler’s own ability does not have a target, so it resolves even if Prowler is not on the battlefield anymore [CR 113.7a]. If a specific permanent is instructed to connive, that permanent connives even if it has left the battlefield [CR 701.50c]. In this scenario, Prowler’s ability instructs Prowler to connive, so Arthur draws a card and then discards a card. Putting a +1/+1 counter on Prowler is impossible, so Arthur skips that part if he discards a nonland card [CR 609.3].

If Arthur put one of Mob Lookout’s abilities on top of the stack, then two of the three remaining abilities are abilities of Prowler and Prowler will connive two more times. If Arthur instead put one of Prowler’s abilities on top of the stack, then only one of the three remaining abilities is an ability of Prowler and Prowler will connive one more time.

Answer E is correct.

A permanent is modified if it has a counter on it, if an Equipment is attached to it, or if an Aura controlled by that permanent’s controller is attached to it [CR 700.9]. The kind of counter or how the Equipment or Aura affects the permanent does not matter.

Costume Closet’s triggered ability is a leaves-the-battlefield trigger, so it triggers based on the game state before an event [CR 603.10]. The rules text of Death Begets Life contains one instruction to destroy all creatures and enchantments, so the three creature tokens and Robotics Mastery are destroyed simultaneously [CR 608.2f]. In the game state immediately prior to those destruction events, all three creature tokens are modified, so Costume Closet’s ability triggers three times.

Answer D is correct.

A permanent is modified if it has a counter on it, if an Equipment is attached to it, or if an Aura controlled by that permanent’s controller is attached to it [CR 700.9].

As the combat damage step begins, Arnold assigns the combat damage of the blocked Spider-Mobile [CR 510.1]. It has trample, so he has to assign 2 damage to Venomized Cat and can distribute the remaining 4 damage as he chooses between Venomized Cat and Nadia [CR 702.19b]. Then all creatures deal their combat damage simultaneously [CR 510.2]. The unblocked Spider-Mobile deals combat damage to Nadia and it has a counter on it, so SP//dr’s ability triggers. If Arnold assigned any of the equipped Spider-Mobile’s combat damage to Nadia, SP//dr’s ability also triggers for that Spider-Mobile, and the ability granted by Biorganic Carapace triggers.

Next, state-based actions are performed and SP//dr, Massacre Girl, the equipped Spider-Mobile, and Venomized Cat are put into their owners’ graveyards [CR 704.3][CR 704.5f–h]. Then, Arnold puts one or three triggered abilities onto the stack; the order does not matter in this scenario. Once triggered, an ability is independent of its source, so the fact that SP//dr and the equipped Spider-Mobile have left the battlefield does not matter for resolving their abilities [CR 113.7a]. Arnold draws one card each time he resolves one of SP//dr’s abilities.

The ability granted by Biorganic Carapace counts how many modified creatures Arnold controls only when it resolves; at that time, Arnold controls only one modified creature, so he draws one card for that ability [CR 608.2h].

Answer E is correct.

The topmost object on the stack is the activated ability of Peter Parker’s Camera, so it’s the first object to resolve [CR 608.1]. It creates a copy of Peter Parker’s activated ability, which becomes the next object to resolve [CR 707.10][CR 405.2].

In general, any spell or ability can transform a modal double-faced permanent, so when the copy resolves, Peter Parker transforms into Amazing Spider-Man. A permanent that transforms does not change zones or become a new object, so Amazing Spider-Man does not count as having entered the battlefield and Aunt May’s ability does not trigger [CR 712.18].

Next, Shock resolves, as its target is still legal, and it deals 2 damage to Amazing Spider-Man. Finally, the original ability of Peter Parker resolves. Amazing Spider-Man does not transform back into Peter Parker though, because that permanent has transformed between the activation and the resolution of the original ability [CR 701.27f].

Answers C and D are correct.

A modal double-faced card has two sets of characteristics, one for each face, but the card is still only one object and only one of those sets is used at any given time [CR 712.8]. In the graveyard, a double-faced card has only the characteristics of its front face [CR 712.8a]. In this scenario, all modal double-faced cards are named Peter Parker and Alex can target only one of them. By default, a modal double-faced card that enters the battlefield from the graveyard enters with its front face up, so Alex can’t return a card as Amazing Spider-Man [CR 712.14].

When comparing the names of two or more objects, their full names are used. Doc Ock, Sinister Scientist and Doctor Octopus, Master Planner may represent the same storyline character, but the cards’ names are different. The same holds true for different characters with the same title, such as Spider-Man, Peter Parker and Spider-Man, Miles Morales. The latter uses a shortened version of its name to refer to itself in its rules text, but that shortened version has no influence on the actual card name and is treated as though it were the full name [CR 201.5c].

Doc Ock, Armed and Dangerous is a version of Lorthos, the Tidemaker printed with a secondary title bar. The name in the top left corner (“Doc Ock, Armed and Dangerous”) has no effect on gameplay; for gameplay purposes, the card has the name printed in the secondary title bar [CR 201.6]. In this scenario, Alex would target two cards named Lorthos, the Tidemaker, which is not legal.

Answer D is correct.

The chapter ability itself does not have a target; when it resolves, it creates a reflexive triggered ability, and only that newly created ability has a target [CR 603.12]. As with any other triggered ability, Abel chooses that target when he puts the reflexive triggered ability onto the stack [CR 603.3d].

So, when Abel puts the chapter ability onto the stack, he does not choose any targets. The ability resolves, Abel mills five cards, and the reflexive triggered ability is created and triggers. Next, Abel puts that reflexive triggered ability onto the stack. The ability’s text does not contain “up to one target creature,” “may,” or anything else that would make it optional, so Abel is forced to target and deal damage to one of his own creatures.

Answer E is correct.

While resolving the chapter ability, its instructions are carried out in order [CR 608.2c]; in this scenario, Andrea and Nora first discard their cards, then Adam and Nestor each lose 3 life. The actions resulting from any single instruction happen simultaneously [CR 101.4]; in this scenario, Andrea and Nora discard simultaneously, and Adam and Nestor lose life simultaneously.

The first instruction also involves one or two choices for each player: each player has to decide whether they want to discard a card, and if so, they have to choose which card to discard. If multiple players have to make choices at the same time, the active player makes all their choices first, followed by each other player in turn order [CR 101.4]; in Two-Headed Giant, each player on the active team makes their choices first, followed by each player on the nonactive team [CR 805.6]. In this scenario, first Andrea and Adam choose that Andrea will discard a card and what card that will be; then, Nora and Nestor choose that Nora will discard a card and what card that will be. While making their choices, Nora and Nestor know that Andrea will discard a card, but they don’t know which one [CR 101.4a–b].

To summarize: Andrea and Adam decide who among them will discard and what they will discard; then Nora and Nestor make their choices, knowing only that Andrea will discard a card; then Andrea and Nora discard simultaneously; last, Adam and Nestor lose life simultaneously.

Answer B is correct.

If a card has an {X} in its mana cost, the value of that {X} is considered 0, unless the card is currently a spell on the stack [CR 107.3g]. In this scenario, the mana value of Primal Might in the graveyard is 1, regardless of any value Alice chose for X while casting Primal Might in the past (if she cast it at all).

In any game zone other than the battlefield or the stack, a modal double-faced card has only the characteristics of its front face [CR 712.8a]. In this scenario, the card in the graveyard has the characteristics of the Peter Parker face; in particular, it has a mana cost of {1}{W} and thus a mana value of 2.

When a player puts a modal triggered ability on the stack, the player has to choose a mode for which they can make legal choices [CR 603.3c]. In this scenario, both modes require exactly one target and Alice has to choose a target if possible [CR 601.2c]. Alice cannot choose the Repair mode because her graveyard doesn’t contain a card with mana value 4 or greater, so she has to choose the Impound mode and target the only artifact or enchantment on the battlefield, her own Wall Crawl.

The instruction to exile the target artifact or enchantment is not optional, so Alice is forced to exile Wall Crawl when the ability resolves.

Answer C is correct.

When the triggered ability is supposed to resolve, one of its two targets is illegal [CR 702.11c]. The other target is legal, so the ability continues to resolve; it cannot make the illegal target perform actions, however, nor can it perform actions upon the illegal target [CR 608.2b].

In this scenario, Andrew is a legal target, so he reveals the top card of his library; Natalie is not a legal target, so the ability cannot make her reveal a card. Andrew does not lose life because there is no card revealed by Natalie, and Natalie does not lose life because she is an illegal target. Andrew puts his card into his hand; Natalie again does nothing.

Answer A is correct.

Putting a +1/+1 counter on Cheering Crowd represents an optional cost that Alex can decide to pay [CR 118.12]. If Alex decides to pay that cost, the “if you do” part will happen once, no matter what events actually occur during the payment of the cost.

Loading Zone’s ability generates a replacement effect that modifies the event of Alex putting a +1/+1 counter on Cheering Crowd [CR 614.1a]. While paying the cost, instead of putting one +1/+1 counter on Cheering Crowd, Alex puts two +1/+1 counters on it [CR 614.6]. The cost is still considered to be paid, so Alex next adds {C} to their mana pool for each counter on Cheering Crowd, which amounts to {C}{C}.

Answer D is correct.

Spider-Man Noir’s ability triggers if Amy declares exactly one attacking creature at the start of the declare attackers step [CR 506.5]. That ability does not have an intervening “if” or some other additional check, so any changes to the set of attacking creatures have no effect on whether the ability resolves, nor on the specific creature the ability refers to. In addition, once triggered, a triggered ability exists independently of its source [CR 113.7a]. In this scenario, the ability will resolve even if Spider-Man Noir has left the battlefield in the meantime.

When Amy resolves Spider-Man Noir’s ability, she is instructed to put a +1/+1 counter on Spider-Man Noir. This is impossible, since Spider-Man Noir is not on the battlefield anymore, so Amy skips that instruction [CR 101.3]. The next instruction is for Amy to surveil. For this instruction, the ability needs information about a specific object that doesn’t exist anymore, so it uses the object’s last known information [CR 608.2h]. The last time Spider-Man Noir was on the battlefield, it had two +1/+1 counters on it, so Amy is instructed to surveil 2.

Answer C is correct.

To cast Fleeting Distraction, Nicole needs to have priority [CR 117.1a]. While Alvin casts Professional Wrestler, no player has priority, so Nicole can only respond with Fleeting Distraction after Alvin has finished casting his spell. By that time, Jackal’s ability has already triggered and is on the stack [CR 117.2a].

The match between the creature spell’s mana value and Jackal’s power is part of the ability’s trigger event, so it’s only checked at the time the ability would trigger. The ability does not have an intervening “if” nor any other condition that is checked on resolution [CR 603.4]. Jackal’s ability therefore resolves and all its effects happen. Alvin copies Professional Wrestler and puts a +1/+1 counter on Jackal.

Answer D is correct.

There is no rule that prohibits noncreature permanents from having +1/+1 counters on them, so the +1/+1 counter stays on Hydro-Man while it’s not a creature.

While the effect of Hydro-Man’s ability applies, it replaces all of Hydro-Man’s card types with just land, and it also removes any creature types Hydro-Man has [CR 205.1a]. The effect does not affect supertypes though, so Hydro-Man is still legendary [CR 205.4b].

When the effect of Hydro-Man’s ability ends, it does not create a successor effect that makes Hydro-Man a 2/2 Elemental Villain creature; the effect simply ceases to affect Hydro-Man, so its characteristic values are once again determined by its printed values plus any other applicable effects [CR 613.1]. In this scenario, those are the effect of Origin of Spider-Man’s chapter ability, which changes Hydro-Man’s creature types from the printed Elemental Villain to Elemental Villain Spider Hero, and the +1/+1 counter which increases its power/toughness from the printed 2/2 to 3/3.

Answer B is correct.

During Anthony’s cleanup step, the continuous effect generated by the crew ability ends [CR 514.2]. The effect of Spider-Man No More’s ability only makes the enchanted permanent a “Citizen,” not a “Citizen creature,” so with the effect of the crew ability gone, Passenger Ferry is not a creature anymore. Spider-Man No More can only enchant a creature [CR 702.5a], so it’s put into Anthony’s graveyard as a state-based action during that same cleanup step [CR 704.5m][CR 514.3a]. If Naomi makes Passenger Ferry an artifact creature during her turn, it will have its printed power/toughness values.

Answer E is correct.

The ability that triggers when the equipped creature attacks is not an ability of Web-Shooters; rather, it is an ability granted by one of Web-Shooters’s actual abilities to the equipped creature. When that ability triggers, it is controlled by the controller of the creature [CR 301.5d][CR 113.8]. That player puts the ability onto the stack and chooses a target for it [CR 603.3]. In this scenario, Anna controls the attacking creature, so she controls the triggered ability and chooses a creature controlled by one of her opponents as the target.

Since the attacking creature has the triggered ability, that creature is the source of the ability [CR 113.7]. In this scenario, that source is multicolored, so Anna cannot choose Niv-Mizzet as the ability’s target, leaving the Human Citizen creature token as the only legal option [CR 702.11d].

Answer D is correct.

Web-Warriors’s ability triggers during the resolution of the first Web of Life and Destiny’s ability and is put onto the stack when Alan gains priority after that resolution [CR 117.3b][CR 117.5]. Nina responds when she gets priority and casts Spectacular Tactics. Without further responses, Spectacular Tactics is the next object to resolve and Cosmic Spider-Man is destroyed [CR 117.4].

Then, Web-Warriors’s ability resolves; Alan controls no other creatures at that moment, so he doesn’t put a +1/+1 counter on any creature. Next, the second Web of Life and Destiny’s ability resolves and Alan puts Spider-Rex onto the battlefield.

Finally, Cosmic Spider-Man’s ability resolves; it does not matter that Cosmic Spider-Man is not on the battlefield anymore [CR 113.7a]. The Spiders affected by that ability are only determined during its resolution, so Web-Warriors and Spider-Rex both gain the five keyword abilities [CR 608.2h]. Since the two creatures have haste, Alan can attack with both and deal 10 combat damage to Nina.

Answer B is correct.

At the start of the combat damage step, both Spider creature tokens deal combat damage to Kraven the Hunter; the damage is dealt simultaneously [CR 510.2]. The trigger condition of the ability granted by Strength of Will only cares about damage being dealt, not about damage from a specific source being dealt, so the two Spiders dealing combat damage constitutes one event for the trigger condition and the ability triggers once. When that ability resolves, Ariana puts six +1/+1 counters on Kraven the Hunter; this triggers Wildwood Scourge’s ability once and Ariana puts a second counter on Wildwood Scourge.

Since the Spiders have first strike, a second combat damage step occurs after the first one. At the start of that step, Kraven the Hunter deals 10 combat damage. Ariana has two relevant options: she can assign all 10 combat damage to one Spider or she can assign 1 damage to each Spider and the rest as she likes among Noah and the two Spiders [CR 510.1c][CR 702.19b].

If Ariana assigns all 10 combat damage to a single Spider, only that Spider is dealt lethal damage and is destroyed as a state-based action [CR 704.5g]. Kraven the Hunter’s ability triggers once and Ariana puts a single +1/+1 counter on Kraven the Hunter; this triggers Wildwood Scourge’s ability once and Ariana puts a third counter on Wildwood Scourge.

If Ariana instead assigns at least 1 damage to each Spider, both Spiders are dealt lethal damage and are simultaneously destroyed by state-based actions [CR 704.3]. Since the Spiders had the same power, both Spiders had the greatest power among creatures Noah controls, and Kraven the Hunter’s ability triggers twice. Each time Ariana resolves an instance of that ability, the ability of Wildwood Scourge triggers; Ariana puts a total of two +1/+1 counters on Wildwood Scourge, bringing the number of counters on Wildwood Scourge to four.

Answer A is correct.

A copy of a spell copies all decisions made for the original, such as an alternative cost paid for it [CR 707.10]. In this scenario, the copy of Sandman’s Quicksand copies Austin’s decision to pay a mayhem cost, so its effects will be identical to those of the original.

Abilities printed on an object that care about an additional cost being paid are always linked to a specific ability that allows that cost to be paid [CR 607.2i]. There is no such rule for alternative costs, so unless the Comprehensive Rules state otherwise for a specific ability (like they do for blitz [CR 702.152b]), an ability which cares about an alternative cost being paid will be satisfied by any ability that allows such an alternative cost to be paid.

Mayhem has no special subrule, so in this scenario, the self-replacement effect of Sandman’s Quicksand will apply regardless of which mayhem cost Austin pays. Nadine’s creatures get -2/-2 two times.

Answer C is correct.

During the combat damage step, Ghost-Spider is supposed to deal 7 combat damage to Nolan. The effect of With Great Power . . .’s ability wants to modify that event. It uses the word “instead” rather than “prevent,” so the effect is a replacement effect, not a prevention effect [CR 614.1a][CR 615.1a]. Applying that effect does not prevent any damage, it just changes who or what the damage is dealt to, so the effect of Spider-Punk’s ability does not interfere.

The modified event is “Ghost-Spider deals 7 combat damage to Anti-Venom.” The effect of Anti-Venom’s ability wants to modify that event. It uses the word “prevent,” so that effect is a prevention effect. Prevention effects still apply to unpreventable damage; no damage is prevented, but any additional effects of the prevention effect still apply [CR 615.12]. In this scenario, the prevention effect does not prevent any of the combat damage, but it still puts a number of +1/+1 counters on Anti-Venom; the number of counters does not depend on how much damage was prevented, so Nolan puts seven +1/+1 counters on Anti-Venom.

Answer A is correct.

There is no rule that prohibits noncreature permanents from having +1/+1 counters on them, so the +1/+1 counter stays on Restless Prairie while it is just a land. Effects that set an object’s power and/or toughness to a specific value are always applied before effects and counters that increase or decrease power and/or toughness [CR 613.4b–c]. In this scenario, the effect of Restless Prairie’s ability is applied before the +1/+1 counter, so Restless Prairie will be 4/4.

Two effects will attempt to modify Restless Prairie’s card types, subtypes, and supertypes: the effect of Origin of Spider-Man’s chapter ability and the effect of Restless Prairie’s own ability. The effect of the chapter ability has an earlier timestamp [CR 613.7b].

If applied in timestamp order, first the chapter ability’s effect attempts to add the legendary supertype and the Spider and Hero subtypes to Restless Prairie’s types. While applying that effect, Restless Prairie is just a land, so the effect only adds the legendary supertype [CR 205.3d][CR 609.3]. Then the effect of Restless Prairie’s ability is applied and adds the creature card type and the Llama subtype to Restless Prairie’s types. This does not affect the legendary supertype, so Restless Prairie ends up being a legendary land creature with just the Llama subtype [CR 205.1b].

The order of effects would change if the chapter ability’s effect were dependent on the effect of Restless Prairie’s ability [CR 613.8]. This is not the case, however. Regardless of the order, the chapter ability’s effect always attempts to add the same three types; the only thing that would change would be the outcome of applying that effect. On its own, a different outcome does not constitute a dependency; something on the “input” side has to change as well [CR 613.8a]. Therefore, the chapter ability’s effect is not dependent and the two effects are applied in timestamp order [CR 613.7]; Restless Prairie will be a legendary Llama, but not a Spider Hero.

Answer A is correct.

The creature token created by the mobilize ability of Zurgo’s Vanguard was created tapped and attacking; Ambrose did not declare it as an attacker at the start of the declare attackers step, so it does not count as having attacked and Relentless Assault does not untap that token [CR 508.4]. Additionally, the token does not have haste.

Zurgo’s Vanguard gets untapped by Relentless Assault and has an ability whose effect states that it must attack each combat if able. During the second combat phase, Ambrose has to declare Zurgo’s Vanguard as an attacker.

Carnage gets untapped by Relentless Assault and is affected by an effect that states that it must attack this turn if able. If such an effect refers to a turn with multiple combat phases, the affected creature has to attack during each combat phase if able [CR 508.1d]. During the second combat phase, Ambrose has to declare Carnage as an attacker.

Answer C is correct.

The effect of Madame Web’s ability grants Alex permission to cast the top card of their library if the resulting spell is a Spider or a noncreature spell. The permission has no other conditions, so Alex is free to pay the spell’s mana cost or any alternative cost available for that spell, such as web-slinging.

Spiders-Man’s enters-the-battlefield ability has a condition which reads “if they were cast using web-slinging.” To fulfill that condition, Spiders-Man must have been cast as a spell and the player casting it must have chosen to use a web-slinging ability of Spiders-Man.

Alex cast the original Spiders-Man and they chose to use one of its web-slinging abilities, so the condition is fulfilled for the original and its ability triggers when it enters the battlefield. A copy of a spell copies all decisions made for the original, such as an alternative cost paid for it; the copy is not cast, however [CR 707.10]. The copy of Spiders-Man only fulfills one part of the condition, so its ability does not trigger when it enters the battlefield.

Answers C, D, and E are correct.

Multiversal Passage has two static abilities: one generates a replacement effect that affects how Multiversal Passage enters the battlefield, and the other generates a type-changing effect. Applying that type-changing effect sets the permanent’s land type to a basic land type; as part of this, Multiversal Passage gains the mana ability corresponding to that basic land type and it loses all abilities derived from its rules text [CR 305.7]. With that effect applied, Multiversal Passage is a Forest, and the effect of Living Lands’s ability applies to it. Multiversal Passage’s characteristic values end up being a 1/1 Forest land creature named Multiversal Passage with “{T}: Add {G}” and no other abilities.

For Multiversal Passage’s copiable characteristic values, the type-changing effects are ignored [CR 707.2]; its copiable values are a land named Multiversal Passage with the two static abilities. The replacement effect of Synth Infiltrator’s ability used those values to define the values granted by its copy effect, with the noted exception. That modification became part of Synth Infiltrator’s copiable values [CR 707.9b]. As a result, Synth Infiltrator’s copiable values are a Synth land artifact creature named Multiversal Passage with the two static abilities.

The replacement effect of Synth Infiltrator’s acquired ability was applied as it entered the battlefield and Nando chose a basic land type for it; the choice made for the original was not copied [CR 707.6]. Just as with Multiversal Passage, applying the type-changing effect to Synth Infiltrator sets its land type, grants it a mana ability, and removes all abilities derived from its rules text; the effect of Living Lands’s ability applies afterward. Synth Infiltrator’s characteristic values end up being a 1/1 Forest Synth land artifact creature named Multiversal Passage with “{T}: Add {G}” and no other abilities.

The replacement effect of Callidus Assassin’s ability uses Synth Infiltrator’s copiable values to define the values granted by its copy effect, with the noted exception. Callidus Assassin’s copiable values are therefore a Synth land artifact creature named Multiversal Passage with the two static abilities and the triggered ability.

The replacement effect of Callidus Assassin’s acquired ability is applied as it enters the battlefield and Alexis chooses a basic land type for it; the choice made for the original is not copied. As before, applying the type-changing effect to Callidus Assassin sets its land type, grants it a mana ability, and removes all abilities derived from its rules text and also any abilities added by the copy effect [CR 305.7]. The effect of Living Lands’s ability applies afterward. Callidus Assassin’s characteristic values end up being a 1/1 Forest Synth land artifact creature named Multiversal Passage with “{T}: Add {G}” and no other abilities. It triggers Elrond’s ability when it enters, but not its own, since it doesn’t actually have that ability.

The Eleventh Hour’s chapter ability uses Callidus Assassin’s copiable values to define the token’s “printed” values, with the noted exceptions. One of those exceptions is a subtype and that subtype is not in addition to any existing types. The first consequence is that the token’s “printed” values include only the Alien subtype and not the Synth subtype [CR 205.1a–b]. The second consequence is that any characteristic-defining abilities affecting subtypes are not copied [CR 707.9d]. Multiversal Passage’s second ability is such a characteristic-defining ability [CR 604.3]. As a result, that ability does not become part of the token’s “printed” values; its “printed” values are therefore a legendary Alien land artifact creature named Prisoner Zero with the static ability that generates an enters-the-battlefield replacement effect and with the triggered ability.

The replacement effect of the token’s static ability is applied as it enters the battlefield and Alexis chooses a basic land type for it; the choice made for the original is not copied. Without the linked characteristic-defining ability, there is no type-changing effect, so the chosen basic land type has no impact on the game state; the token does not become a Forest. This has two consequences: one is that the triggered ability is not removed, so that ability actually triggers, along with Elrond’s; the other consequence is that the effect of Living Lands’s ability does not apply to the token, so its power and toughness remain undefined. An undefined toughness is treated as 0, so the token is put into Alexis’s graveyard as a state-based action [CR 208.5][CR 704.5f].

When Alexis puts the token’s triggered ability onto the stack, she cannot choose a legal target, since there are no other creatures named Prisoner Zero on the battlefield. The ability does say “up to one” though, so Alexis is forced to choose zero targets; the ability resolves without having any effects.

Elrond’s ability resolves and since this is the second time the ability has resolved this turn, the Ring tempts Alexis. She cannot choose the token as her Ring-bearer, because it’s no longer on the battlefield [CR 701.54a].

As for playing cards from three or four different IPs in the same deck, there is no game or tournament rule against it. Which is a good thing—otherwise, this question would never have been written.