Warmonger's Chariot is a uncommon Artifact — Equipment card from Rise of the Eldrazi (ROE), collector number 226. Current market price: $0.15 (foil $0.35), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+2. As long as equipped creature has defender, it can attack as though it didn't have defender. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)