Will to Slaughter

Each player sacrifices a creature if {b} was
spent to cast this spell and Will to Slaughter
deals 3 damage to any target if {r} was spent to
cast this spell.
{2}{b}{r}, {t}: Each player sacrifices a creature,
then Will to Slaughter deals X damage to each
player who didn't sacrifice a creature, where X
is equal to your devotion to black and red.
An end in death...