Toph, Earthbending Master

Legendary Creature — Human Warrior Ally {3}{G} 2/4

Landfall — Whenever a land you control enters, you get an experience counter. Whenever you attack, earthbend X, where X is the number of experience counters you have. (Target land you control becomes a 0/0 creature with haste that's still a land. Put X +1/+1 counters on it. When it dies or is exiled, return it to the battlefield tapped.)