Mortuary + Bolas's Citadel + Viscera Seer + Proper Burial

Mortuary

Bolas's Citadel

Viscera Seer

Proper Burial

How it works

1. Activate Viscera Seer by sacrificing it.
2. When Viscera Seer dies, Mortuary and Proper Burial trigger.
3. Resolve the Mortuary trigger, putting Viscera Seer from your graveyard onto the top of your library.
4. Resolve the Proper Burial 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 clever engine lets you feed your own creatures into an endless sacrificial loop, turning life into a self-sustaining resource. With Bolas's Citadel providing the crucial permission to cast spells directly from the top of your library while bypassing their mana costs with life, you can play out whatever you sacrifice. Viscera Seer serves as the necessary sacrifice outlet to send your creatures away, while Mortuary instantly intercepts that trip by returning the creature right back to the top of your library. Finally, Proper Burial offsets the life payments demanded by Bolas's Citadel, giving you back life equal to the toughness of the creature you just lost to keep the loop going indefinitely.