Mortuary + Lithatog + Phyrexian Walker + Gwenom, Remorseless

Mortuary

Lithatog

Phyrexian Walker

Gwenom, Remorseless

How it works

1. Activate Lithatog 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 Lithatog ability.
4. Cast Phyrexian Walker from the top of your library by paying 0 life.
5. Repeat.

This clever loop starts with Lithatog acting as the sacrifice outlet for Phyrexian Walker, sending the artifact creature to the graveyard to pump its stats. The moment Phyrexian Walker hits the graveyard, Mortuary steps in to instantly recycle it straight back to the top of your library. From there, Gwenom, Remorseless enables you to cast that very same Phyrexian Walker straight from the top of your library for free by paying zero life instead of its mana cost, allowing you to feed the loop infinitely.