Kamehameha

This spell does X damage, where X is the amount
of mana paid into casting this spell.
Once per turn, if a Human Warrior, Saiyan
Warrior, or Turtle School Student would be sent
to your graveyard, you may cast this spell from
the graveyard. If you do, and you pay mana
equivalent to the attacking creature's
toughness, your creature remains on the
battlefield with half its toughness until the end
of your next turn.