Mortuary + Cauldron Familiar + Umbral Collar Zealot + Gwenom, Remorseless

Mortuary

Cauldron Familiar

Umbral Collar Zealot

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 Umbral Collar Zealot 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 Umbral Collar Zealot ability.
6. Repeat.

This clever loop turns the graveyard into your personal library top-deck, letting you recast your threats for free. With Gwenom, Remorseless active, you bypass mana costs to cast Cauldron Familiar straight from the top of your library by paying life instead, a cost easily offset by the cat's own life-draining entry trigger. Every time Umbral Collar Zealot sacrifices the cat, Mortuary effortlessly catches it on its way to the graveyard and slides it right back to the top of your library to repeat the cycle.