Mortuary + Bolas's Citadel + Tinder Wall + Venerated Stormsinger

Mortuary

Bolas's Citadel

Tinder Wall

Venerated Stormsinger

How it works

1. Activate Tinder Wall by sacrificing it.
2. When Tinder Wall dies, Mortuary and Venerated Stormsinger trigger.
3. Resolve the Mortuary trigger, putting Tinder Wall 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. Cast Tinder Wall from the top of your library by paying 1 life.
6. Repeat.

This ingenious loop transforms life into an endless engine of destruction by turning Bolas's Citadel into a twisted conduit that lets you cast Tinder Wall straight from the top of your library for a mere pittance of life instead of its mana cost. Each time you sacrifice Tinder Wall for red mana, Mortuary catches it on the way to the graveyard and neatly stacks it right back onto the top of your library where Bolas's Citadel can see it again. Meanwhile, Venerated Stormsinger sits on the battlefield watching the carnage, turning every single death into a life-draining trigger that effortlessly outpaces the life you pay to keep casting your spells.