Mortuary + Bolas's Citadel + Carrion Feeder + Venerated Stormsinger

Mortuary

Bolas's Citadel

Carrion Feeder

Venerated Stormsinger

How it works

1. Activate Carrion Feeder by sacrificing it.
2. When Carrion Feeder dies, Mortuary and Venerated Stormsinger trigger.
3. Resolve the Mortuary trigger, putting Carrion Feeder from your graveyard onto the top of your library.
4. Resolve the Venerated Stormsinger trigger, causing you to gain 1 life and each opponent to lose 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 clever loop puts a clever twist on graveyard recursion by turning your library into a self-replenishing hand. With Bolas's Citadel allowing you to cast creatures straight off the top of your library for life instead of mana, you can sacrifice Carrion Feeder to its own ability, sending it to the graveyard where Mortuary immediately intercepts it to place it right back on top of your library. As this cycle spins, Venerated Stormsinger acts as the ultimate engine of attrition, draining your opponents and gaining you life every time a creature dies—comfortably offsetting the life payment exacted by Bolas's Citadel to keep the ritual going indefinitely.