Maester Seymour {2}{G}
Legendary Creature — Human Elf Cleric
At the beginning of combat on your turn, put a number of +1/+1 counters equal to Maester Seymour's power on another target creature you control.
{3}{G}{G}: Monstrosity X, where X is the number of counters among creatures you control. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)
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Cards that do something similar expected a card that isn't here?
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Jenova, Ancient Calamity 89%
$1.60#4565
"At the beginning of combat on your turn, put a number of +1/+1 counters equal to this card's power on up to one other target creature. That creature becomes a Mutant in addition to its other types."
Nemesis of Mortals 85%
$0.09#18725
"{7}{G}{G}: Monstrosity 5. This ability costs {1} less to activate for each creature card in your graveyard."