Creature â Wall
Whenever Wall of Frost blocks a creature, that creature doesn't untap during its controller's next untap step.
Wall of Frostâ€™s ability tracks the creature, not the creatureâ€™s controller. That is, if the creature changes controllers before its first controllerâ€™s next untap step, then it wonâ€™t untap during its new controllerâ€™s next untap step.
If the creature isnâ€™t tapped during its controllerâ€™s next untap step (perhaps because it was untapped by a spell), Wall of Frostâ€™s ability has no effect at that time. It wonâ€™t try to keep the creature tapped on subsequent turns.
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