A: That would be NAP, its owner. “Cards in the exile zone are not controlled by any player, since in a normal game only emblems plus things on the stack and battlefield have controllers. (CR109.4) And since Darigaaz Reincarnated doesn’t currently have a controller, the words “you” and “your” on it refer to its owner, so that’s the player whose upkeep it’s looking for. (CR109.5) When its ability triggers, that ability will be controlled by Darigaaz’s owner, since Darigaaz has no controller. (CR112.8) And of course, the controller of a triggered ability is the player who carries out its instructions. (Unless specified otherwise, which isn’t happening here.). It doesn’t matter who controlled Darigaaz when it was exiled, nor who controlled the effect that caused it to be put into exile in the first place–all that matters is that it is in exile, and has an egg counter on it.”

Approved by Callum Milne
Cards: Darigaaz Reincarnated; Hijack

A: “The rules for casting spells (CR 601) describe what happens if a player is unable to finish casting a spell, say because they’re unable to pay its costs: the casting of the spell is illegal, and the game returns to the moment before the casting of that spell was proposed. This means that not only will the spell be back in its owner’s hand, but the mana abilities Player B activated will also be undone. Player B’s lands will be untapped, and they will have no mana floating.” A DQ for Cheating could be considered, as this interaction is very similar with the Goblin Test Pilot + Suppression Field.

Approved by Callum Milne

Cards: Huddle Up

A: “Lantern of Insight doesn’t change anything about how Sleight of Hand works – NAP is not entitled to know which of the two cards AP puts into their hand, regardless of whether or not the top card of the library happens to be revealed at the time.

In paper play, NAP may be able to figure out which card was picked by tracking the physical motion of the cards as AP performs the actions Sleight of Hand calls for, but that’s on them to pick up on–it’s not information the game provides.”

Approved by Callum Milne

Cards: Lantern of Insight; Sleight of Hand

A: “Once the first Bramblewood Paragon has been applied and both of the remaining effects are applicable, the player may choose to apply whichever one they prefer, and then the remaining one will be applied afterwards. If they want to apply the effects in that order, they can do so.

For your second question, the number of counters the creature will be entering the battlefield with is recalculated every time an effect is applied. Applying the effects in the order Paragon -> Vigor -> Paragon, it goes from being:

(Creature will enter with no counters) -> (Creature will enter with one +1/+1 counter) -> (Creature will enter with two +1/+1 counters) -> (Creature will enter with three +1/+1 counters)

So it’s not likely that players will choose to order these replacements in this manner, because it will result in fewer counters, but it is a possible option.”

Approved by Callum Milne

Cards: Bramblewood Paragon; Primal Vigor