Ancient Imperiosaur is a rare Creature — Dinosaur card from March of the Machine (MOM), collector number 174. Current market price: $0.37 (foil $0.44), TCGplayer market prices via Scryfall.
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Trample, ward {2} This creature enters with two +1/+1 counters on it for each creature that convoked it.