Church of Sorrow

{t}: Add {c} to your mana pool
Whenever a creature you control is put into a graveyard or exile from anywhere, add a sin counter to Church of Sorrow.
Remove 13 sin counters from Church of Sorrow, put an indestructible legendary 13/13 token creature called Swallower of Penance into play.
Church of Sorrow can be your commander.
Partner with Father of Sorrow