Mortuary + Zulaport Cutthroat + Bolas's Citadel + Goblin Firestarter

Mortuary

Zulaport Cutthroat

Bolas's Citadel

Goblin Firestarter

How it works

1. Activate Goblin Firestarter by sacrificing it.
2. When Goblin Firestarter dies, Mortuary and Zulaport Cutthroat trigger.
3. Resolve the Mortuary trigger, putting Goblin Firestarter from your graveyard onto the top of your library.
4. Resolve the Zulaport Cutthroat 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 clever loop turns a humble Goblin Firestarter into a self-sustaining engine by turning its self-sacrifice into an endless cycle of rebirth. Thanks to Mortuary, the goblin never truly stays in the graveyard, instead sliding right back onto the top of your library where Bolas's Citadel allows you to recast it for a mere 1 life rather than its usual mana cost. Meanwhile, Zulaport Cutthroat acts as your ultimate win condition, turning every single iteration of this death loop into draining life from your opponents while replenishing the life you spent to cast the goblin through the Citadel.