Leaden Fists is a common Enchantment — Aura card from Dominaria Remastered (DMR), collector number 57. Current market price: $0.09 (foil $0.13), 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.