Oro, Green Mana incarnate

Haste, Trample, Flash, Indestructible
When Oro enters the battlefield or at the beginning of your upkeep, put an incarnation counter on Oro.
At the beginning of your combat step target land becomes a 6/6 elemental creature.
Remove an Incarnation counter from Oro: Destroy target noncreature permanent, add 3 mana of any color to your mana pool, put a permanent from your hand onto the battlefield.