Mortuary + Thermopod + Bolas's Citadel + Willow Geist

Mortuary

Thermopod

Bolas's Citadel

Willow Geist

How it works

1. Activate Thermopod 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. Cast Willow Geist from the top of your library by paying 1 life due to Bolas's Citadel.
6. Repeat.

This ingenious loop turns a simple sacrifice into a perpetual motion machine by weaponizing the top of your library. When you feed Willow Geist to Thermopod, you generate red mana while triggering both the Geist's own death effect and Mortuary, which instantly redirects the creature from your graveyard back to the top of your library. From there, Bolas's Citadel lets you replay the Geist by trading life instead of mana, smoothly feeding back into the loop. Every iteration also coaxes a +1/+1 counter onto Willow Geist as its card leaves the graveyard, ensuring that its life-gaining death trigger completely offsets the life you pay to the Citadel.