Mortuary + Zulaport Cutthroat + Bolas's Citadel + Fanatical Firebrand

Mortuary

Zulaport Cutthroat

Bolas's Citadel

Fanatical Firebrand

How it works

1. Activate Fanatical Firebrand by tapping and sacrificing it.
2. When Fanatical Firebrand dies, Mortuary and Zulaport Cutthroat trigger.
3. Resolve the Mortuary trigger, putting Fanatical Firebrand 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 Fanatical Firebrand ability.
6. Cast Fanatical Firebrand from the top of your library by paying 1 life.
7. Repeat.

This loop turns a humble Goblin into an unstoppable engine by leveraging the top-deck manipulation of Bolas's Citadel to cast creatures without spending mana. As Fanatical Firebrand cycles between the battlefield and your graveyard, Mortuary ensures the pirate never stays dead by instantly returning it to the top of your library. Meanwhile, Zulaport Cutthroat acts as the ultimate reaper, turning every sacrifice and death into a steady stream of life loss for your opponents and life gain for you to offset the life payment required by the Citadel.