Colossal Treant

Reach, Trample, Vigilance
Whenever Colossal Treant attacks, it gets +3/+0 until end of turn.
Whenever Colossal Treant blocks a creature, it gets +0/+3 until end of turn.
"The spirits of nature are our allies and willing to manifest by our side. We must simply create a form grand enough for their designs."