Mortuary + Viscera Seer + Bolas's Citadel + Tarpan

Mortuary

Viscera Seer

Bolas's Citadel

Tarpan

How it works

1. Activate Viscera Seer 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 Viscera Seer ability.
6. Cast Tarpan from the top of your library by paying 1 life due to Bolas's Citadel.
7. Repeat.

This clever loop uses Mortuary to instantly recycle any creature sacrificed to Viscera Seer right back to the top of your library, where Bolas's Citadel lets you recast it immediately without spending mana. Normally, casting spells off the Citadel would drain you to death, but sacrificing Tarpan creates a continuous stream of life gain that offsets the Citadel's life-payment cost. Together, these four cards lock into a self-sustaining engine that lets you churn through your deck, manipulate your draws with endless scry triggers, and build an astronomical storm count.