Kax, Firemind Warrior

{t}: Kax, Firemind Warrior deals damage equal to
it's power to any target.
Whenever another red source you control deals
non-combat damage to a player, untap Kax,
Firemind Warrior.
{r}{r}: Exile the top card of your library. Until
your next turn, you may cast it without paying
it's mana cost.