Mortuary + Ashes of the Abhorrent + Bolas's Citadel + Fanatical Firebrand

Mortuary

Ashes of the Abhorrent

Bolas's Citadel

Fanatical Firebrand

How it works

1. Activate Fanatical Firebrand by tapping it and sacrificing it.
2. When Fanatical Firebrand dies, Mortuary and Ashes of the Abhorrent trigger.
3. Resolve the Mortuary trigger, putting Fanatical Firebrand from your graveyard onto the top of your library.
4. Resolve the Ashes of the Abhorrent trigger, causing you to gain 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 turns a humble goblin into a lethal engine by using Bolas's Citadel to cast spells directly from the top of your library for life instead of mana. When you activate Fanatical Firebrand to ping an opponent, it heads to the graveyard, triggering Mortuary to seamlessly recycle it back onto the top of your library. Meanwhile, Ashes of the Abhorrent cushions the cost by turning each creature death into a steady stream of life gain, offsetting the life you pay to replay the goblin over and over.