Nezahal, Primal Tide is a rare Legendary Creature — Elder Dinosaur card from Rivals of Ixalan (RIX), collector number 45. Current market price: $8.72 (foil $22.12), 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.