Mortuary + Krark-Clan Ironworks + Phyrexian Walker + Gwenom, Remorseless

Mortuary

Krark-Clan Ironworks

Phyrexian Walker

Gwenom, Remorseless

How it works

1. Activate Krark-Clan Ironworks 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 elegant loop turns the zero-cost artifact creature Phyrexian Walker into an infinite engine by leveraging Mortuary to constantly recycle it back to the top of your library every time it hits the graveyard. Krark-Clan Ironworks provides the necessary sacrifice outlet to generate a steady stream of colorless mana while sending the Walker to its doom. Meanwhile, Gwenom, Remorseless grants you the ability to look at and cast cards straight from the top of your library, swapping traditional mana costs for life payments that are trivially free for a zero-mana creature.