Barbed Batterfist is a common Artifact — Equipment card from The List (PLST), collector number ONE-121. Current market price: $0.05, TCGplayer market prices via Scryfall.
For Mirrodin! (When this Equipment enters, create a 2/2 red Rebel creature token, then attach this to it.) Equipped creature gets +1/-1. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)