The card returned to its ownerâ€™s hand may be the card they discard. If itâ€™s the only card in that playerâ€™s hand, it must be discarded.
If you target the only Zombie you control with Compelling Deterrence, you wonâ€™t discard a card.
Compelling Deterrence targets only the nonland permanent. If that permanent becomes an illegal target, Compelling Deterrence doesnâ€™t resolve and that player doesnâ€™t discard a card.
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