Cast Cauldron Familiar either from your hand or from the top of your library by paying or 1 life respectively.
When Cauldron Familiar enters, it triggers, causing each opponent to lose 1 life and you to gain 1 life.
Activate Viscera Seer by sacrificing Cauldron Familiar.
When Cauldron Familiar dies, Mortuary triggers, putting Cauldron Familiar from your graveyard onto the top of your library.
Resolve the Viscera Seer ability.
Repeat.
This clever loop turns a modest cat into an engine of relentless attrition, fueled entirely by the quiet presence of **Mortuary** redirecting your casualties straight back to the top of your library. When you sacrifice **Cauldron Familiar** to **Viscera Seer**, its entry and exit triggers drain your opponents while **Mortuary** sets up the very top card of your library for the next repetition. Meanwhile, **Gwenom, Remorseless** pulls double duty by granting you lifelink and allowing you to bypass mana costs entirely to recast the Familiar from the top of your library using life instead, completely sustaining the loop's momentum.