Mortuary + Cruel Celebrant + Bolas's Citadel + Fanatical Firebrand

Mortuary

Cruel Celebrant

Bolas's Citadel

Fanatical Firebrand

How it works

1. Activate Fanatical Firebrand by tapping and sacrificing it.
2. When Fanatical Firebrand dies, Mortuary and Cruel Celebrant trigger.
3. Resolve the Mortuary trigger, putting Fanatical Firebrand from your graveyard onto the top of your library.
4. Resolve the Cruel Celebrant 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 transforms Bolas's Citadel from a powerful card-advantage engine into a lethal weapon by letting you cast Fanatical Firebrand directly from the top of your library for a mere 1 life instead of its mana cost. The moment the goblin is sacrificed to its own ability, Mortuary immediately intercepts it, placing the creature back onto the top of your library so Bolas's Citadel can play it once again. Meanwhile, Cruel Celebrant watches the carnage unfold, converting every single iteration of this cycle into a draining effect that outpaces the life you pay to the Citadel.