Ghalta, Primal Hunger is a rare Legendary Creature — Elder Dinosaur card from Rivals of Ixalan Promos (PRIX), collector number 130s. Current market price: — (foil $4.25), TCGplayer market prices via Scryfall.
This spell costs {X} less to cast, where X is the total power of creatures you control. Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)