Mortuary + Shilgengar, Sire of Famine + Bolas's Citadel + Tarpan

Mortuary

Shilgengar, Sire of Famine

Bolas's Citadel

Tarpan

How it works

1. Activate Shilgengar by sacrificing Tarpan.
2. When Tarpan dies, it and Mortuary triggers.
3. Resolve the Mortuary trigger, putting Tarpan from your graveyard onto the top of your library.
4. Resolve the Tarpan trigger, causing you to gain 1 life
5. Resolve the Shilgengar ability.
6. Cast Tarpan from the top of your library by paying 1 life due to Bolas's Citadel.
7. Repeat.

This intricate loop turns the humble Tarpan into an infinite engine for blood and life, fueled entirely by the life-paying prowess of Bolas's Citadel. By sacrificing the Tarpan to Shilgengar, Sire of Famine, you trigger Mortuary to neatly recycle the creature straight back to the top of your library instead of letting it rest in the graveyard. From there, Bolas's Citadel lets you cast the Tarpan directly off the top of your library for a mere 1 life—which is immediately offset by the life you gain when the Tarpan dies—allowing you to repeat this sacrifice loop endlessly to generate infinite Blood tokens and death triggers.