Bludgeon Brawl is a rare Enchantment card from New Phyrexia (NPH), collector number 80. Current market price: $0.53 (foil $9.00), TCGplayer market prices via Scryfall.
Each noncreature, non-Equipment artifact is an Equipment with equip {X} and "Equipped creature gets +X/+0," where X is that artifact's mana value.