Mortuary + Bolas's Citadel + Viscera Seer + Moldervine Reclamation

Mortuary

Bolas's Citadel

Viscera Seer

Moldervine Reclamation

How it works

1. Activate Viscera Seer by sacrificing it.
2. When Viscera Seer dies, Mortuary and Moldervine Reclamation trigger.
3. Resolve the Moldervine Reclamation trigger, causing you to gain 1 life and draw a card.
4. Resolve the Mortuary trigger, putting Viscera Seer from your graveyard onto the top of your library.
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 your graveyard into a revolving door by leveraging Mortuary to constantly intercept your creatures and place them right back on top of your library. Bolas's Citadel acts as the engine's beating heart, letting you bypass traditional mana costs to recast that creature using your life total instead. Meanwhile, Viscera Seer provides the essential sacrifice outlet to kick off the cycle while smoothing your draws, and Moldervine Reclamation ensures you not only draw the sacrificed creature back into your hand (or conveniently Citadel range) but also pad your life total to keep paying for the Citadel's toll.