Mortuary + Cruel Celebrant + Bolas's Citadel + Goblin Firestarter

Mortuary

Cruel Celebrant

Bolas's Citadel

Goblin Firestarter

How it works

1. Activate Goblin Firestarter by sacrificing it.
2. When Goblin Firestarter dies, Mortuary and Cruel Celebrant trigger.
3. Resolve the Mortuary trigger, putting Goblin Firestarter from your graveyard onto the top of your library.
4. Resolve the Cruel Celebrant trigger, causing you to gain 1 life and each opponent to lose 1 life.
5. Resolve the Goblin Firestarter ability.
6. Cast Goblin Firestarter from the top of your library by paying 1 life.
7. Repeat.

This elegant loop turns the top of your deck into a self-sustaining engine by letting Bolas's Citadel bypass mana costs, allowing you to continually cast Goblin Firestarter directly from your library for a mere single life payment. Every time you sacrifice Goblin Firestarter to deal its damage, Mortuary quietly intercepts it from the graveyard to place it right back on top of your library, ensuring the fodder never truly runs out. Meanwhile, Cruel Celebrant watches the carnage unfold, translating every iteration of this sacrifice loop into a draining torrent of life loss for your opponents and life gain for you.