Batterbone is a uncommon Artifact — Equipment card from Modern Horizons 2 (MH2), collector number 221. Current market price: $0.31 (foil $0.36), TCGplayer market prices via Scryfall.
Living weapon (When this Equipment enters, create a 0/0 black Phyrexian Germ creature token, then attach this to it.) Equipped creature gets +1/+1 and has vigilance and lifelink. Equip {5}