Cruel Deceiver

{1}: Look at the top card of your library. {2}: Reveal the top card of your library. If it's a land card, this creature gains "Whenever this creature deals damage to a creature, destroy that creature" until end of turn. Activate only once each turn.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oey47anidpb1hx98fwi81.