Mortuary + Bolas's Citadel + Proper Burial + Fanatical Firebrand

Mortuary

Bolas's Citadel

Proper Burial

Fanatical Firebrand

How it works

1. Activate Fanatical Firebrand by tapping and sacrificing it.
2. When Fanatical Firebrand dies, Mortuary and Proper Burial trigger.
3. Resolve the Mortuary trigger, putting Fanatical Firebrand from your graveyard onto the top of your library.
4. Resolve the Proper Burial 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 clever loop turns a humble goblin into an unending engine of destruction by turning your library into a recycling bin. With Bolas's Citadel allowing you to cast spells directly from the top of your deck using life instead of mana, you can continuously play Fanatical Firebrand after sacrificing it to its own ability. Every time the Firebrand hits the graveyard, Mortuary neatly places it right back on top of your library, while Proper Burial cushions the life cost of Bolas's Citadel by giving you life equal to the sacrificed creature's toughness.