Mortuary + Mogg Fanatic + Vindictive Vampire + Bolas's Citadel

Mortuary

Mogg Fanatic

Vindictive Vampire

Bolas's Citadel

How it works

1. Activate Mogg Fanatic by sacrificing it.
2. When Mogg Fanatic dies, Mortuary and Vindictive Vampire trigger.
3. Resolve the Mortuary trigger, putting Mogg Fanatic from your graveyard onto the top of your library.
4. Resolve the Vindictive Vampire trigger, causing you to gain 1 life and dealing 1 damage to each opponent.
5. Resolve the Mogg Fanatic ability.
6. Cast Mogg Fanatic from the top of your library by paying 1 life.
7. Repeat.

This recursive loop turns Mogg Fanatic into an infinite damage engine by keeping it in a perpetual cycle of sacrifice and rebirth. Whenever you sacrifice Mogg Fanatic to deal a point of damage, Mortuary immediately intercepts it from the graveyard and places it right back on top of your library. From there, Bolas's Citadel allows you to recast the goblin directly off the top, turning the mana cost into a negligible life payment that is instantly offset and outpaced by Vindictive Vampire, which drains your opponents and pads your life total with every single death.