Mortuary + Thermopod + Phyrexian Walker + Bolas's Citadel

Mortuary

Thermopod

Phyrexian Walker

Bolas's Citadel

How it works

1. Activate Thermopod by sacrificing Phyrexian Walker
2. When Phyrexian Walker dies, Mortuary triggers, putting Phyrexian Walker from your graveyard onto the top of your library.
3. Cast Phyrexian Walker from the top of your library by paying 0 life.
4. Repeat.

This clever loop turns zero-mana creatures into an infinite engine by leveraging Bolas's Citadel to cast Phyrexian Walker straight from the top of your library for free, bypassing traditional mana costs by trading life instead. Once the artifact creature hits the battlefield, you immediately feed it to Thermopod to generate red mana and fuel the sacrifice loop. As soon as Phyrexian Walker goes to the graveyard, Mortuary steps in to instantly place it back on top of your library, setting up Bolas's Citadel to cast it all over again in perpetual motion.