Mortuary + Cauldron Familiar + Bloodflow Connoisseur + Gwenom, Remorseless

Mortuary

Cauldron Familiar

Bloodflow Connoisseur

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 Bloodflow Connoisseur 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 Bloodflow Connoisseur ability.
6. Repeat.

This clever loop turns a modest cat into an endless engine of life drain by weaponizing Mortuary to instantly recycle Cauldron Familiar back to the top of your library every time Bloodflow Connoisseur feeds on it. Once that repeating sacrifice-and-return cycle is established, Gwenom, Remorseless steps in as the linchpin, letting you bypass traditional mana costs entirely to recast the Familiar from the top of your library for a mere drop of life—a cost easily offset by the cat's own entering-the-battlefield trigger.