Keldon Battlewagon is a rare Artifact Creature — Juggernaut card from Prophecy (PCY), collector number 139. Current market price: $0.25 (foil $7.69), TCGplayer market prices via Scryfall.
Trample This creature can't block. When this creature attacks, sacrifice it at end of combat. Tap an untapped creature you control: This creature gets +X/+0 until end of turn, where X is the power of the creature tapped this way.