Mortuary + Blood Pet + Overgrowth Elemental + Gwenom, Remorseless

Mortuary

Blood Pet

Overgrowth Elemental

Gwenom, Remorseless

How it works

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

This clever loop harnesses Blood Pet as both the fuel and the recurring engine, letting you sacrifice it for black mana while its death simultaneously triggers Mortuary to place it right back on top of your library. Overgrowth Elemental acts as the vital bridge during this sequence, converting every death into a life-gain trigger that offsets the cost to keep the chain moving. Meanwhile, Gwenom, Remorseless grants you the crucial ability to look at and cast creatures directly from the top of your library, paying life instead of mana so that Blood Pet can emerge endlessly over and over again.