Karai, Future of the Foot

Sneak {2}{W}{B} (You may cast this spell for {2}{W}{B} if you also return an unblocked attacker you control to hand during the declare blockers step. She enters tapped and attacking.) Whenever Karai deals combat damage to a player, return target creature card from your graveyard to your hand. If her sneak cost was paid

this turn, instead return that card to the battlefield.

From Magic: The Gathering.

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