Mortuary + Blood Pet + Relic Vial + Gwenom, Remorseless

Mortuary

Blood Pet

Relic Vial

Gwenom, Remorseless

How it works

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

This ingenious loop transforms a humble Blood Pet into an engine of endless attrition, fueled entirely by life-paying shenanigans rather than actual mana. While Blood Pet's sacrifice provides the initial black mana, Mortuary ensures the creature never truly leaves your control by immediately recycling it back to the top of your library. From there, Gwenom, Remorseless grants you the ability to cast it directly from the library while deftly substituting its mana cost with a simple life payment. Meanwhile, Relic Vial acts as both the sacrificial outlet to draw cards and the lethal payoff, draining your opponents' life totals and padding your own to sustain Gwenom's alternative casting cost indefinitely.