Mortuary + Bolas's Citadel + Overgrowth Elemental + Myr Scrapling

Mortuary

Bolas's Citadel

Overgrowth Elemental

Myr Scrapling

How it works

1. Activate Myr Scrapling by sacrificing it.
2. When Myr Scrapling dies, Mortuary and Overgrowth Elemental trigger.
3. Resolve the Mortuary trigger, putting Myr Scrapling from your graveyard onto the top of your library.
4. Resolve the Overgrowth Elemental trigger, causing you to gain 1 life
5. Resolve the Myr Scrapling ability.
6. Cast Myr Scrapling from the top of your library by paying 1 life.
7. Repeat.

This ingenious loop turns a tiny mechanical bug into an engine of endless power by turning your library into a recycling bin. You begin by sacrificing Myr Scrapling to its own ability, which triggers Mortuary to immediately tuck it back onto the top of your library. Meanwhile, Overgrowth Elemental watches from the battlefield, turning every single death into a net-zero life transaction that offsets the life you pay to recast the automaton. Because Bolas's Citadel lets you cast spells directly from the top of your library by paying life instead of mana, you can recast the scrappy construct over and over again for just 1 life a pop, fueling infinite death triggers, life gain, and storm count without ever running out of fuel.