Just having five counters will not transform Ludevic’s Test Subject.

is a double faced card that has the potential to transform when its activated ability resolves. This activated abitliy does two things, its puts a hatchling counter on Ludevic’s Test Subject and then if there are five or more of these counters on its at that point, the counters are removed and the card is […]

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Darkthicket Wolf’s ability can only be activated once per turn, regardless of who controls it.

‘s activated ability has a restriction on it preventing the ability from being activated more than once per turn. This restriction applies regardless of who controls it when the ability is played. For example, if Darkthicket Wolf’s ability is activated by Player A and then this Darkthicket Wolf is targeted by played by Player B, […]

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Once Goblin Tunneler’s ability resolves the targeted creature is unblockable even if it gets bigger.

has an activated ability that makes a creature with power of two or less unblockable for the remainder of the current turn. This ability does have a targeting restriction which requires that the targeted creature have a power of two or less. In other words this creature’s power must be two or less in order […]

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Rusted Sentinel’s ability applied as it enters the battlefield

has one ability which causes it to enter the battlefield tapped. This is a static ability that generates a replacement effect that is applied to the action of putting the Sentinel into play. (This will most often happen as the Rusted Sentinel spell resolves.) The Sentinel does not enter the battlefield and then become tapped. […]

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