Mortuary + Yahenni, Undying Partisan + Willow Geist + Gwenom, Remorseless

Mortuary

Yahenni, Undying Partisan

Willow Geist

Gwenom, Remorseless

How it works

1. Activate Yahenni by sacrificing Willow Geist.
2. When Willow Geist dies, it and Mortuary triggers.
3. Resolve the Mortuary trigger, putting Willow Geist from your graveyard onto the top of your library.
4. Resolve the Willow Geist trigger, causing you to gain 1 life
5. Resolve the Yahenni ability.
6. Cast Willow Geist from the top of your library by paying 1 life due to Gwenom.
7. Repeat.

This clever loop turns a simple sacrifice engine into an endless recycling machine, fueled entirely by the life-paying magic of Gwenom, Remorseless. When you activate Yahenni, Undying Partisan to sacrifice Willow Geist, Mortuary steps in to instantly intercept the spirit and slide it right back to the top of your library instead of letting it rest. Meanwhile, Willow Geist's own death trigger cushions the blow by feeding you life, offsetting the life cost you pay to cast it right back off the top of your library using Gwenom's alternative casting ability.