Mirran Banesplitter is a common Artifact — Equipment card from March of the Machine (MOM), collector number 154. Current market price: $0.18 (foil $0.36), TCGplayer market prices via Scryfall.
Flash When this Equipment enters, attach it to target creature you control. Equipped creature gets +2/+0. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)