Mortuary + Ashnod's Altar + Bolas's Citadel + Fear of Lost Teeth

Mortuary

Ashnod's Altar

Bolas's Citadel

Fear of Lost Teeth

How it works

1. Activate Ashnod's Altar 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. Cast Fear of Lost Teeth from the top of your library by paying 1 life due to Bolas's Citadel.
6. Repeat.

This clever loop turns life into an endless engine of destruction by leveraging Bolas's Citadel to cast creatures straight from the top of your library for life instead of mana. When you sacrifice Fear of Lost Teeth to Ashnod's Altar, you generate a pair of colorless mana while triggering its death ability to offset the life payment and deal incremental damage. Meanwhile, Mortuary intercepts the creature as it hits the graveyard, instantly placing it back on top of your library so Bolas's Citadel can play it all over again.