Requiem, Salvation Bringer

Other Clerics you control have: {t}: Sacrifice
This creature: add {b}{b}{b}, use this mana only to cast Demons from hand or graveyard

{b}{b},{t}: Pay 1 life: Create 3, 0/1 black Cleric creature tokens
{b}{b}{b},{t}: Pay 3 life: Create a 5/5 black Demon Creature token
{10}{b}{b}{b},{t}, Pay 13 life: Destroy all none-Demon Creatures.