Toph, Earthbending Master (Extended Art)

{3}{G} - Legendary Creature — Human Warrior Ally - 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.)