Bioplasm is a rare Creature — Ooze card from Guildpact (GPT), collector number 81. Current market price: $0.29 (foil $1.19), TCGplayer market prices via Scryfall.
Whenever this creature attacks, exile the top card of your library. If it's a creature card, this creature gets +X/+Y until end of turn, where X is the exiled creature card's power and Y is its toughness.