Dark Devotion

{x}{r}: Sacrifice X ally creatures. They can't be regenerated. Add that many devotion counters on
this.
{1}: As an additional cost, you must have 20
devotion counters. Summon a tapped Angel of Apostasy. Exile this card.
"Blood must spill in the name of the Angel! The
sinners shall pay for their crimes, and the virtuous
shall prosper!"
- Carasah, Dark Magic Preacher