Emrakul, Maturing Monster

Indestructible, Annihilator 2
When you cast Emrakul, Maturing Monster, destroy target land.
"And with each passing day, the soon to be destroyer of worlds, grew stronger. Once she figured out that giant worms weren't enough, Emrakul sought more power. A mysterious source taught her of mana, and how to planeswalk. After killing her teacher, she arrived on Zendikar..."