Mortuary + Viscera Seer + Bolas's Citadel + Willow Geist

Mortuary

Viscera Seer

Bolas's Citadel

Willow Geist

How it works

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

This loop turns your library into an endless engine of rebirth, letting you sacrifice and recast Willow Geist infinitely while cycling it through your graveyard. Mortuary acts as the crucial glue here, intercepting the Geist the moment it hits the graveyard and immediately placing it back on top of your library so you never actually run out of gas. Meanwhile, Bolas's Citadel bypasses traditional mana costs entirely, letting you pay a trivial amount of life to cast the Geist straight off the top of your deck, while Viscera Seer gives you a free, repeatable sacrifice outlet that also lets you manipulate your scry triggers along the way.