Mortuary + Daxos, Blessed by the Sun + Bolas's Citadel + Carrion Feeder

Mortuary

Daxos, Blessed by the Sun

Bolas's Citadel

Carrion Feeder

How it works

1. Activate Carrion Feeder by sacrificing it.
2. When Carrion Feeder dies, Mortuary and Daxos trigger.
3. Resolve the Mortuary trigger, putting Carrion Feeder from your graveyard onto the top of your library.
4. Resolve the Daxos 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. When Carrion Feeder enters, Daxos triggers, causing you to gain 1 life.
8. Repeat.

This elegant loop turns the lifecycle of a single creature into an engine of endless vitality. By leveraging Bolas's Citadel, you can bypass traditional mana costs to recast your fodder straight from the top of your library, paying life instead of mana while keeping your hand entirely free. Carrion Feeder acts as the self-sacrificing heart of the operation, while Mortuary catches it on its way to the graveyard and instantly recycles it back to the top of your library to maintain the endless cycle. Meanwhile, Daxos, Blessed by the Sun acts as your benevolent scorekeeper, netting you a steady stream of lifegain on both entry and exit to comfortably offset the life you spend casting your spells through the Citadel.