Grim Giganotosaurus

Creature — Dinosaur10/10$5.67

{10}{B}{G}: Monstrosity 10. This ability costs {1} less to activate for each creature with power 4 or greater your opponents control. (If this creature isn't monstrous, put ten +1/+1 counters on it and it becomes monstrous.) When this creature becomes monstrous, destroy all artifacts and creatures other than this creature.

Legal in Commander

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