Leaden Fists is a common Enchantment — Aura card from Future Sight (FUT), collector number 38. Current market price: $0.12 (foil $0.53), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) Enchant creature Enchanted creature gets +3/+3 and doesn't untap during its controller's untap step.