Primal Might is a rare Sorcery card from Core Set 2021 Promos (PM21), collector number 197s. Current market price: — (foil $0.47), TCGplayer market prices via Scryfall.
Target creature you control gets +X/+X until end of turn. Then it fights up to one target creature you don't control. (Each deals damage equal to its power to the other.)