Revenge of the Drowned is a common Instant card from Innistrad: Double Feature (DBL), collector number 72. Current market price: $0.17 (foil $0.40), TCGplayer market prices via Scryfall.
Target creature's owner puts it on their choice of the top or bottom of their library. You create a 2/2 black Zombie creature token with decayed. (It can't block. When it attacks, sacrifice it at end of combat.)