Go for Blood is a common Sorcery card from Ikoria: Lair of Behemoths (IKO), collector number 122. Current market price: $0.28 (foil $0.34), TCGplayer market prices via Scryfall.
Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.) Cycling {1} ({1}, Discard this card: Draw a card.)