Tyrranax Rex is a mythic Creature — Phyrexian Dinosaur card from Phyrexia: All Will Be One (ONE), collector number 189. Current market price: $6.12 (foil $6.36), TCGplayer market prices via Scryfall.
This spell can't be countered. Trample, ward {4}, haste Toxic 4 (Players dealt combat damage by this creature also get four poison counters.)