Gohan, Unlimited Potential

Creatures you control have prowess.
Whenever Gohan, Unlimited Potential attacks,
exile target noncreature, nonland card with
mana value lessthan Gohan's power from
a graveyard and copy it.
You may cast the copy without
paying its mana cost.
"No! I can't just stay here and do nothing,
I'm going down there!"