Ruthless Predation is a common Sorcery card from Phyrexia: All Will Be One (ONE), collector number 182. Current market price: $0.24 (foil $0.13), TCGplayer market prices via Scryfall.
Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control. (Each deals damage equal to its power to the other.)