Mortuary + Bolas's Citadel + Yahenni, Undying Partisan + Willow Geist

Mortuary

Bolas's Citadel

Yahenni, Undying Partisan

Willow Geist

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 Bolas's Citadel.
7. Repeat.

This clever loop turns a self-sustaining cycle into an engine of endless growth and life manipulation. You use Bolas's Citadel to cast spells directly from the top of your library by paying life instead of mana, allowing you to repeatedly play Willow Geist for just one life. When Yahenni, Undying Partisan sacrifices the Geist, Mortuary steps in to instantly redirect the creature from your graveyard back to the top of your library. Meanwhile, Willow Geist's own death trigger cushions the life payment by giving you life equal to its power as it heads out, ensuring your life total remains stable while you churn through infinite sacrifice and storm counts.