Chitinous Cloak is a uncommon Artifact — Equipment card from Oath of the Gatewatch (OGW), collector number 163. Current market price: $0.15 (foil $0.30), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+2 and has menace. (It can't be blocked except by two or more creatures.) Equip {3}