Mortuary + Bolas's Citadel + Viscera Seer + Lunarch Veteran // Luminous Phantom

Mortuary

Bolas's Citadel

Viscera Seer

Lunarch Veteran // Luminous Phantom

How it works

1. Activate Viscera Seer by sacrificing it.
2. When Viscera Seer dies, Mortuary and Luminous Phantom triggers if it's on the battlefield
3. Resolve the Mortuary trigger, putting Viscera Seer from your graveyard onto the top of your library.
4. Resolve the Luminous Phantom trigger, if applicable, causing you to gain 1 life
5. Resolve the Viscera Seer ability.
6. Cast Viscera Seer from the top of your library by paying 1 life.
7. When Viscera Seer enters, Lunarch Veteran triggers if it's on the battlefield, causing you to gain 1 life.
8. Repeat.

This clever loop lets you recast the same creature endlessly by turning Bolas's Citadel into a self-contained engine, bypassing mana costs entirely by paying life instead. Viscera Seer acts as the sacrifice outlet that triggers Mortuary, which immediately recycles the seer right back to the top of your library where Bolas's Citadel can see it. Meanwhile, Lunarch Veteran buffers your life total with every entry and departure, effortlessly offsetting the life you pay to cast the spell over and over again.