Mortuary + Carmen, Cruel Skymarcher + Blood Pet + Gwenom, Remorseless

Mortuary

Carmen, Cruel Skymarcher

Blood Pet

Gwenom, Remorseless

How it works

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

This clever loop sets up an endless cycle of sacrifice and rebirth by turning Mortuary into a conveyor belt that immediately recycles your fallen creatures back to the top of your library. When you sacrifice Blood Pet for black mana, its death triggers both Mortuary's library-stacking effect and Carmen, Cruel Skymarcher's growth ability, which steadily pumps up her power while padding your life total. Meanwhile, Gwenom, Remorseless provides the crucial alternative casting permission that lets you bypass mana costs entirely, letting you replay Blood Pet straight from the top of your library by simply paying life instead.