Goku, Pure of Heart

All creatures you control gain "{t}, Goku's controller gains {e}

{u}{r}{t}, Exert Goku: You may pay any amount of
{e}, deal twice that much damage to any target and counter any number of spells with total mana value less than or equal to the amount of {e} paid this way.

"You just don't know when to stop! Enough is enough!"