Mortuary + Bolas's Citadel + Bastion of Remembrance + Fanatical Firebrand

Mortuary

Bolas's Citadel

Bastion of Remembrance

Fanatical Firebrand

How it works

1. Activate Fanatical Firebrand by tapping and sacrificing it.
2. When Fanatical Firebrand dies, Mortuary and Bastion of Remembrance trigger.
3. Resolve the Mortuary trigger, putting Fanatical Firebrand from your graveyard onto the top of your library.
4. Resolve the Bastion of Remembrance 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 ingenious loop relies on Bolas's Citadel to let you cast creature spells straight from the top of your library by paying life instead of mana. When you sacrifice Fanatical Firebrand to its own ability, Mortuary immediately intervenes to place it right back on top of your library rather than letting it rest in the graveyard. Meanwhile, Bastion of Remembrance acts as the ultimate engine for this exchange, turning every single iteration into life drain and gain to safely offset the life you spent casting the Goblin.