Hidden Footblade is a uncommon Artifact — Equipment card from Assassin's Creed (ACR), collector number 34. Current market price: $0.31 (foil $0.35), TCGplayer market prices via Scryfall.
Flash When this Equipment enters, attach it to target creature you control. That creature gains first strike until end of turn. Equipped creature gets +1/+0 and has haste. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)