Mortuary + Bolas's Citadel + Moonlit Wake + Carrion Feeder

Mortuary

Bolas's Citadel

Moonlit Wake

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing it.
2. When Carrion Feeder dies, Mortuary and Moonlit Wake trigger.
3. Resolve the Mortuary trigger, putting Carrion Feeder from your graveyard onto the top of your library.
4. Resolve the Moonlit Wake 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 elegant loop transforms Bolas's Citadel from a powerful card-advantage engine into a self-sustaining sacrifice storm by leveraging the top of your library as your hand. With Mortuary intercepting your dying creatures and immediately recycling them back to the library's peak, Bolas's Citadel allows you to recast them endlessly. Meanwhile, Moonlit Wake cushions the life cost of casting spells from your library, and Carrion Feeder acts as the self-sacrificing catalyst that keeps the entire cycle moving.