Warmonger's Chariot is a uncommon Artifact — Equipment card from Jumpstart (JMP), collector number 490. Current market price: $0.32, 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.)