Nezahal, Primal Tide is a rare Legendary Creature — Elder Dinosaur card from Rivals of Ixalan Promos (PRIX), collector number 45p. Current market price: $11.73 (foil $29.99), TCGplayer market prices via Scryfall.
This spell can't be countered. You have no maximum hand size. Whenever an opponent casts a noncreature spell, draw a card. Discard three cards: Exile Nezahal. Return it to the battlefield tapped under its owner's control at the beginning of the next end step.