Mortuary + Bile Urchin + Blood Artist + Gwenom, Remorseless

Mortuary

Bile Urchin

Blood Artist

Gwenom, Remorseless

How it works

1. Activate Bile Urchin by sacrificing it.
2. When Bile Urchin dies, Mortuary and Blood Artist trigger.
3. Resolve the Mortuary trigger, putting Bile Urchin from your graveyard onto the top of your library.
4. Resolve the Blood Artist trigger, causing you to gain 1 life and target opponent to lose 1 life.
5. Resolve the Bile Urchin ability.
6. Cast Bile Urchin from the top of your library by paying 1 life.
7. Repeat.

This grisly loop starts by sacrificing Bile Urchin to drain an opponent's life, sending the tiny creature to the graveyard where Mortuary instantly intercepts it to place it right back on top of your library. Meanwhile, Blood Artist watches the carnage unfold, turning every death into a net-zero life transaction that offsets the cost of the operation. Once Gwenom, Remorseless attacks, her venomous combat prowess grants you permission to cast spells directly from the top of your library, trading mana for life. Because Gwenom lets you pay life instead of mana, you can recast Bile Urchin over and over, looping the entire engine to drain the table dry.