Cruel Deceiver is a common Creature — Spirit card from Champions of Kamigawa (CHK), collector number 106. Current market price: $0.12 (foil $0.36), TCGplayer market prices via Scryfall.
{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.