The Brethren of Skirsdag

Morbid -{w}{b}, {t}: Create a 1/1 white and black
Cleric token for each creature that died this turn.
{r}{b}, {t}: Sacrifice five Clerics you control:
Search your library for a Demon creature card and
put it onto the battlefield. You lose life equal to its converted mana cost.
No more talk of angels from these priests. Avacyn
is dead. It's time for Innistrad to worship anew.