Mortuary + Carmen, Cruel Skymarcher + Myr Scrapling + Gwenom, Remorseless

Mortuary

Carmen, Cruel Skymarcher

Myr Scrapling

Gwenom, Remorseless

How it works

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

This loop turns a humble sacrifice into an endless engine of growth and recycling. By sacrificing Myr Scrapling, you trigger Mortuary to place it right back on top of your library, while Carmen, Cruel Skymarcher simultaneously grows larger and gains you life from the sacrifice. Gwenom, Remorseless then steps in to bypass normal costs, letting you recast Myr Scrapling straight from the top of your library by paying life instead of mana.