Rules Text Contains10BG: Monstrosity 10. This ability costs 1 less to activate for each creature with power 4 or greater your opponents control. <em>(If this creature isn't monstrous, put ten +1/+1 counters on it and it becomes monstrous.)</em>
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When Grim Giganotosaurus becomes monstrous, destroy all artifacts and creatures other than Grim Giganotosaurus.