Mortuary + Bolas's Citadel + Viscera Seer + Overgrowth Elemental

Mortuary

Bolas's Citadel

Viscera Seer

Overgrowth Elemental

How it works

1. Activate Viscera Seer by sacrificing it.
2. When Viscera Seer dies, Mortuary and Overgrowth Elemental trigger.
3. Resolve the Mortuary trigger, putting Viscera Seer from your graveyard onto the top of your library.
4. Resolve the Overgrowth Elemental trigger, 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. Repeat.

This elegant loop turns a simple vampire seer into an immortal engine by letting you repeatedly sacrifice and recast her for the ultimate cost of a single life. With Bolas's Citadel granting permission to cast spells directly from the top of your library by paying life instead of mana, you can deploy Viscera Seer right back to the battlefield the moment Mortuary tucks her back onto your library. Meanwhile, Overgrowth Elemental quietly sits back and gains you 1 life whenever a creature dies, completely offsetting the life you pay to Bolas's Citadel and keeping your health total safe while you generate an infinite storm count, sacrifice triggers, and death triggers.