Rith, Liberated Primeval is a mythic Legendary Creature — Dragon card from Dominaria United Promos (PDMU), collector number 214p. Current market price: $10.43 (foil $11.25), TCGplayer market prices via Scryfall.
Flying, ward {2} Other Dragons you control have ward {2}. At the beginning of your end step, if a creature or planeswalker an opponent controlled was dealt excess damage this turn, create a 4/4 red Dragon creature token with flying.