Bramble Armor is a common Artifact — Equipment card from Innistrad: Crimson Vow (VOW), collector number 188. Current market price: $0.22 (foil $0.15), TCGplayer market prices via Scryfall.
When this Equipment enters, attach it to target creature you control. Equipped creature gets +2/+1. Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)