Conjure Demon

As additional cost to cast this spell, you may sacrifice any number of non-demon creatures.
Search your library for a demon creature card
with mana value less or equal to amount of
creatures sacrificed that way, put it onto the battlefield, then shuffle your library. Lose 1 life
for each non-human sacrificed that way.
"Hear our call, come forth, oh Lord, and cleans us
from our sin."