Arbor Colossus {2}{G}{G}{G}
Creature — Giant
Reach
{3}{G}{G}{G}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When this creature becomes monstrous, destroy target creature with flying an opponent controls.
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Cards that do something similar expected a card that isn't here?
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Nemesis of Mortals 89%
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"{7}{G}{G}: Monstrosity 5. This ability costs {1} less to activate for each creature card in your graveyard."
Maester Seymour 80%
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"{3}{G}{G}: Monstrosity X, where X is the number of counters among creatures you control."