Mortuary + Carmen, Cruel Skymarcher + Mogg Fanatic + Bolas's Citadel

Mortuary

Carmen, Cruel Skymarcher

Mogg Fanatic

Bolas's Citadel

How it works

1. Activate Mogg Fanatic by sacrificing it.
2. When Mogg Fanatic dies, Mortuary and Carmen trigger.
3. Resolve the Mortuary trigger, putting Mogg Fanatic from your graveyard onto the top of your library.
4. Resolve the Carmen trigger, causing you to gain 1 life and put a +1/+1 counter on Carmen.
5. Resolve the Mogg Fanatic ability.
6. Cast Mogg Fanatic from the top of your library by paying 1 life.
7. Repeat.

This clever loop centers around Mogg Fanatic acting as a self-sacrificing engine that triggers Mortuary to seamlessly place itself back onto the top of your library instead of staying in the graveyard. Bolas's Citadel then bypasses traditional mana costs, allowing you to recast Mogg Fanatic straight off the top of your library for a mere 1 life. Meanwhile, Carmen, Cruel Skymarcher feeds on every sacrifice by growing larger and netting you life to offset the Citadel's cost, turning a simple goblin into an infinite machine of damage, death triggers, and +1/+1 counters.