Phantom Blade is a uncommon Artifact — Equipment card from Assassin's Creed (ACR), collector number 29. Current market price: $0.31 (foil $0.30), TCGplayer market prices via Scryfall.
When this Equipment enters, attach it to up to one target creature you control. Destroy up to one other target creature. Equipped creature gets +1/+1 and has menace. (It can't be blocked except by two or more creatures.) Equip {2}