Mortuary + Shilgengar, Sire of Famine + Bolas's Citadel + Fear of Lost Teeth

Mortuary

Shilgengar, Sire of Famine

Bolas's Citadel

Fear of Lost Teeth

How it works

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

This loop turns a modest bat into an engine of endless sacrifice by leveraging Mortuary to constantly intercept your creature cards as they hit the graveyard and gently place them right back on top of your library. From there, Bolas's Citadel lets you effortlessly recast Fear of Lost Teeth straight off the top, turning the life cost to cast spells into a non-issue since Fear of Lost Teeth's own death trigger gains that life right back. Meanwhile, Shilgengar, Sire of Famine fuels the entire operation by turning each sacrifice into a Blood token, generating an endless cascade of triggers, damage, and artifacts to overwhelm your opponents.