Mortuary + Thermopod + Bolas's Citadel + Kobolds of Kher Keep

Mortuary

Thermopod

Bolas's Citadel

Kobolds of Kher Keep

How it works

1. Activate Thermopod by sacrificing Kobolds of Kher Keep
2. When Kobolds of Kher Keep dies, Mortuary triggers, putting Kobolds of Kher Keep from your graveyard onto the top of your library.
3. Cast Kobolds of Kher Keep from the top of your library by paying 0 life.
4. Repeat.

This delightful loop turns the ultimate cost-free creature into a self-sustaining engine, fueled entirely by life rather than mana. By utilizing Bolas's Citadel, you can continually cast Kobolds of Kher Keep directly from the top of your library for zero life since its mana value is zero. Once the little creature enters the battlefield, you feed it to Thermopod to generate red mana and fire off a death trigger. That sacrifice immediately triggers Mortuary, placing Kobolds of Kher Keep right back onto the top of your library so Bolas's Citadel can reveal it once more.