Mortuary + Shilgengar, Sire of Famine + Phyrexian Walker + Bolas's Citadel

Mortuary

Shilgengar, Sire of Famine

Phyrexian Walker

Bolas's Citadel

How it works

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

This clever loop turns Shilgengar, Sire of Famine into a relentless engine by utilizing Mortuary to constantly recycle your fallen creatures right back to the top of your library. From there, Bolas's Citadel allows you to immediately cast Phyrexian Walker from the top of your library for free—paying zero life due to its mana value—so it can be sacrificed to Shilgengar all over again. Each iteration feeds the sacrifice loop to generate infinite Blood tokens and death triggers without ever running out of fodder.