Mortuary + Bolas's Citadel + Fanatical Firebrand + Susurian Voidborn

Mortuary

Bolas's Citadel

Fanatical Firebrand

Susurian Voidborn

How it works

1. Activate Fanatical Firebrand by tapping and sacrificing it.
2. When Fanatical Firebrand dies, Mortuary and Susurian Voidborn trigger.
3. Resolve the Mortuary trigger, putting Fanatical Firebrand from your graveyard onto the top of your library.
4. Resolve the Susurian Voidborn trigger, causing you to gain 1 life and target 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 elegant loop turns the top of your library into an endless armory, fueled entirely by life rather than mana. With Bolas's Citadel allowing you to cast spells directly from the top, you can repeatedly deploy Fanatical Firebrand by paying just a single point of life for its mana value. Each time you sacrifice the Firebrand, Mortuary smoothly catches it on its way to the graveyard and places it right back on top of your library to be cast again. Meanwhile, Susurian Voidborn turns this endless cycle of death into a lethal drain on your opponents while padding your own life total to keep paying Bolas's Citadel's cost.