Mortuary + Carmen, Cruel Skymarcher + Bile Urchin + Gwenom, Remorseless

Mortuary

Carmen, Cruel Skymarcher

Bile Urchin

Gwenom, Remorseless

How it works

1. Activate Bile Urchin by sacrificing it.
2. When Bile Urchin dies, Mortuary and Carmen trigger.
3. Resolve the Mortuary trigger, putting Bile Urchin 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 Bile Urchin ability.
6. Cast Bile Urchin from the top of your library by paying 1 life.
7. Repeat.

This looping engine turns a simple sacrifice into an infinite drain loop by seamlessly recycling your resources. When you activate Bile Urchin, its death triggers Mortuary to seamlessly place it back on top of your library, while Carmen feeds on the permanent sacrifice by growing with a +1/+1 counter and padding your life total. Meanwhile, Gwenom acts as the ultimate enabler, allowing you to bypass mana costs and recast the Urchin straight off the top of your library by paying life, which Carmen's life-gaining trigger helps offset.