Battle of Fire and Ice

{t}: Add {b} or {r}.
{b}{r}, {t}: Destroy target creature.
{b}{b}{b}{r}{r}{r}, {t}, Sacrifice Battle of Fire and
Ice: Each opponent loses half of their life total,
rounded up. Put X 1/1 black and red Wolf
Demon tokens onto the battlefield, where X is
the amount of life lost this way.