Mortuary + Phyrexian Walker + Yahenni, Undying Partisan + Gwenom, Remorseless

Mortuary

Phyrexian Walker

Yahenni, Undying Partisan

Gwenom, Remorseless

How it works

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

This loop turns a free sacrifice outlet into a perpetual motion machine by completely bypassing traditional mana costs. With Gwenom, Remorseless granting permission to cast spells directly from the top of your library while swapping mana costs for life payments, playing the zero-mana Phyrexian Walker becomes entirely free in terms of mana. Every time Phyrexian Walker hits the graveyard, Mortuary intercepts it to place it right back on top of your library, perfectly positioned for Gwenom, Remorseless to play it again. Meanwhile, Yahenni, Undying Partisan happily serves as the graveyard-bound executioner, growing ever larger and processing endless sacrifice triggers with zero resource drain.