Warmonger's Chariot is a uncommon Artifact — Equipment card from Conspiracy (CNS), collector number 207. Current market price: $0.08 (foil $0.39), 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.)