Ulgathoth's Enmity

{t}, pay 2 life: Add {b} to your manapool for each
black permanent you control.
Sacrifice a creature you control: Add {b} to your
mana pool equal to sacrificed creatures manacost.
"The day they fell, is the same day the demons and
horrors crawled to claim the surface. Ulgathoth brought
about this great darkness that stains my body, we must
end it." ~Vellermar, The Gate Keeper of Fire.