Boommobile is a rare Artifact — Vehicle card from Aetherdrift Promos (PDFT), collector number 113s. Current market price: — (foil $0.41), TCGplayer market prices via Scryfall.
When this Vehicle enters, add four mana of any one color. Spend this mana only to activate abilities. Exhaust — {X}{2}{R}: This Vehicle deals X damage to any target. Put a +1/+1 counter on this Vehicle. (Activate each exhaust ability only once.) Crew 2