Mortuary + Bolas's Citadel + Carrion Feeder + Overgrowth Elemental

Mortuary

Bolas's Citadel

Carrion Feeder

Overgrowth Elemental

How it works

1. Activate Carrion Feeder by sacrificing it.
2. When Carrion Feeder dies, Mortuary and Overgrowth Elemental trigger.
3. Resolve the Mortuary trigger, putting Carrion Feeder from your graveyard onto the top of your library.
4. Resolve the Overgrowth Elemental trigger, causing you to gain 1 life
5. Resolve the Carrion Feeder ability.
6. Cast Carrion Feeder from the top of your library by paying 1 life.
7. Repeat.

This loop transforms a simple sacrifice into an engine of endless life and ritual. By pairing Bolas's Citadel with Mortuary, you bypass normal card draw constraints by continuously playing Carrion Feeder straight off the top of your library for life instead of mana. Meanwhile, Overgrowth Elemental steps in as the crucial life-generating linchpin, turning every death in this cycle into a net-neutral or positive life exchange that offsets the Citadel's cost while Carrion Feeder grows ever larger.