Cheapest priced copy (Oath of the Gatewatch): $0.35 at Card Kingdom, near mint, their price list as of .
Chitinous Cloak 
Artifact — Equipment · Uncommon · Oath of the Gatewatch · #163
Equipped creature gets +2/+2 and has menace. (It can't be blocked except by two or more creatures.)
Equip {3}
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Oath of the Gatewatch | 163 | Uncommon | $0.35 | $0.49 |