Tetzimoc, Primal Death is a rare Legendary Creature — Elder Dinosaur card from Rivals of Ixalan Promos (PRIX), collector number 86p. Current market price: $4.03 (foil $7.87), TCGplayer market prices via Scryfall.
Deathtouch {B}, Reveal this card from your hand: Put a prey counter on target creature. Activate only during your turn. When Tetzimoc enters, destroy each creature your opponents control with a prey counter on it.