Mortuary + Bolas's Citadel + Fanatical Firebrand + Venerated Stormsinger

Mortuary

Bolas's Citadel

Fanatical Firebrand

Venerated Stormsinger

How it works

1. Activate Fanatical Firebrand by tapping and sacrificing it.
2. When Fanatical Firebrand dies, Mortuary and Venerated Stormsinger trigger.
3. Resolve the Mortuary trigger, putting Fanatical Firebrand from your graveyard onto the top of your library.
4. Resolve the Venerated Stormsinger 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 your library into an endless firing range by leveraging Bolas's Citadel to cast creatures straight off the top at the cost of life rather than mana. When you sacrifice Fanatical Firebrand to ping a target, Mortuary steps in to immediately catch it from the graveyard and place it right back on top of your library for the Citadel to play again. Meanwhile, Venerated Stormsinger sits on the board to watch the carnage, turning every single death into a life swing that easily outpaces the life you pay to recast your goblin.