Polymorph is a rare Sorcery card from Ninth Edition (9ED), collector number 90★. Current market price: — (foil $31.84), TCGplayer market prices via Scryfall.
Destroy target creature. It can't be regenerated. Its controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield, then shuffles all other cards revealed this way into their library.