The Colossal Dreadmaw is a rare Legendary Creature — Dinosaur card from Unknown Event (UNK), collector number RG06b. Current market price: $39.00, TCGplayer market prices via Scryfall.
Trample You may cast creature cards from your hand as though they were the card Colossal Dreadmaw. (They become Colossal Dreadmaws.)