
Instant
Return target nonland permanent to its owner's hand. Then that player discards a card if you control a Zombie.
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The card returned to its owner’s hand may be the card they discard. If it’s the only card in that player’s hand, it must be discarded if you control a Zombie.
If the target nonland permanent is an illegal target as Compelling Deterrence tries to resolve, it won’t resolve and none of its effects will happen. No player will discard a card.
Compelling Deterrence checks to see if you control a Zombie after the target nonland permanent is returned to its owner’s hand. For example, if you target the only Zombie you control with Compelling Deterrence, you won’t discard a card.