Brainspoil is a common Sorcery card from Ravnica: City of Guilds (RAV), collector number 78. Current market price: $0.23 (foil $2.53), TCGplayer market prices via Scryfall.
Destroy target creature that isn't enchanted. It can't be regenerated. Transmute {1}{B}{B} ({1}{B}{B}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)