Mortuary + Umbral Collar Zealot + Bolas's Citadel + Kobolds of Kher Keep

Mortuary

Umbral Collar Zealot

Bolas's Citadel

Kobolds of Kher Keep

How it works

1. Activate Umbral Collar Zealot 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. Resolve the Umbral Collar Zealot ability.
4. Cast Kobolds of Kher Keep from the top of your library by paying 0 life.
5. Repeat.

This loop transforms your library into an endless engine by leveraging Bolas's Citadel to cast spells directly from the top, where its ability to play the top card for life payment lets you deploy Kobolds of Kher Keep for zero mana. Whenever that little beast hits the graveyard, Mortuary instantly steps in to rescue it, placing the creature right back on top of your library. From there, Umbral Collar Zealot provides the necessary sacrifice outlet to keep the cycle turning while simultaneously fueling its own surveil mechanic to ensure smooth mechanics.