Mortuary + Ashnod's Altar + Memnite + Bolas's Citadel

Mortuary

Ashnod's Altar

Memnite

Bolas's Citadel

How it works

1. Activate Ashnod's Altar by sacrificing Memnite
2. When Memnite dies, Mortuary triggers, putting Memnite from your graveyard onto the top of your library.
3. Cast Memnite from the top of your library by paying 0 life.
4. Repeat.

This loop creates an engine of pure recycling by turning free creatures into raw power. Ashnod's Altar provides the combustion chamber, turning your sacrifices into colorless mana, while Mortuary catches Memnite on its way to the graveyard and effortlessly tucks it right back onto the top of your library. From there, Bolas's Citadel allows you to bypass mana costs entirely, letting you replay Memnite from the top of your library for zero life over and over again.