Mortuary + Dross Harvester + Bolas's Citadel + Fanatical Firebrand

Mortuary

Dross Harvester

Bolas's Citadel

Fanatical Firebrand

How it works

1. Activate Fanatical Firebrand by tapping and sacrificing it.
2. When Fanatical Firebrand dies, Mortuary and Dross Harvester trigger.
3. Resolve the Mortuary trigger, putting Fanatical Firebrand from your graveyard onto the top of your library.
4. Resolve the Dross Harvester trigger, causing you to gain 2 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 your library into an endless ammunition belt by turning a tiny goblin into a perpetual motion machine. Fanatical Firebrand acts as your primary sacrifice engine, pinging away at targets while continuously feeding itself back into the cycle. Whenever it dies, Mortuary ensures the creature returns straight to the top of your library instead of lingering in the graveyard, perfectly setting up Bolas's Citadel to recast the spell from the top of your deck. Because casting with Bolas's Citadel costs life instead of mana, Dross Harvester steps in with its life-gaining death trigger to offset the self-inflicted damage, easily sustaining the loop and letting you burn out the table indefinitely.