Mortuary + Bile Urchin + Bastion of Remembrance + Gwenom, Remorseless

Mortuary

Bile Urchin

Bastion of Remembrance

Gwenom, Remorseless

How it works

1. Activate Bile Urchin by sacrificing it.
2. When Bile Urchin dies, Mortuary and Bastion of Remembrance trigger.
3. Resolve the Mortuary trigger, putting Bile Urchin from your graveyard onto the top of your library.
4. Resolve the Bastion of Remembrance trigger, causing you to gain 1 life and each 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 loop turns a simple sacrifice into a devastating engine by turning your library into a recurring hand. When you sacrifice Bile Urchin, Mortuary instantly intercepts it on the way to the graveyard, placing the urchin back on top of your library. Meanwhile, Bastion of Remembrance triggers off the death to drain your opponents and cushion your life total. That life buffer is vital because Gwenom, Remorseless grants you the ability to cast spells directly from the top of your library by paying life equal to their mana cost, allowing you to instantly replay the Bile Urchin over and over again.