Spry and Mighty is a rare Sorcery card from Lorwyn Eclipsed (ECL), collector number 329. Current market price: $0.46 (foil $0.69), TCGplayer market prices via Scryfall.
Choose exactly two creatures you control. You draw X cards and the chosen creatures get +X/+X and gain trample until end of turn, where X is the difference between the chosen creatures' powers.