Mortuary + Cauldron Familiar + Phantom Train + Gwenom, Remorseless

Mortuary

Cauldron Familiar

Phantom Train

Gwenom, Remorseless

How it works

1. Cast Cauldron Familiar either from your hand or from the top of your library by paying or 1 life respectively.
2. When Cauldron Familiar enters, it triggers, causing each opponent to lose 1 life and you to gain 1 life.
3. Activate Phantom Train by sacrificing Cauldron Familiar.
4. When Cauldron Familiar dies, Mortuary triggers, putting Cauldron Familiar from your graveyard onto the top of your library.
5. Resolve the Phantom Train ability.
6. Repeat.

This loop transforms Phantom Train into a fatal recurring sacrifice outlet by leveraging Mortuary to instantly recycle cards right back to the top of your library. From there, Gwenom, Remorseless lets you bypass traditional mana costs to cast those recycled permanents by paying life instead, seamlessly feeding Cauldron Familiar back onto the battlefield. As the Familiar continually enters and exits the graveyard, its automatic entry trigger drains your opponents dry while padding your life total to safely sustain Gwenom's life-payment cost.