Ari-sen

Indestructible, reach, defender
{g}{w},{t}: Put a +1/+1-counter on Ari-sen.
With six +1/+1 counters, Ari-sen looses defender.
With twelfe +1/+1 counters, he gains trample.
With eighteen +1/+1 counters, he gains flying.
"He had outgrown himself"
—The gardeneer