Dragonclaw Strike is a uncommon Sorcery card from Tarkir: Dragonstorm (TDM), collector number 180. Current market price: $0.24 (foil $0.29), TCGplayer market prices via Scryfall.
Double the power and toughness of target creature you control until end of turn. Then it fights up to one target creature an opponent controls. (Each deals damage equal to its power to the other.)