Mizzium Tank is a rare Artifact — Vehicle card from War of the Spark Promos (PWAR), collector number 138s. Current market price: — (foil $1.05), TCGplayer market prices via Scryfall.
Trample Whenever you cast a noncreature spell, this Vehicle becomes an artifact creature and gets +1/+1 until end of turn. Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)