Remembrance + Mortuary + Umbral Collar Zealot + Kobolds of Kher Keep

Remembrance

Mortuary

Umbral Collar Zealot

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 and Remembrance trigger.
3. Resolve the Mortuary trigger, putting Kobolds of Kher Keep from your graveyard on top of your library.
4. Resolve the Remembrance trigger, searching your library for Kobolds of Kher Keep and putting it into your hand.
5. Resolve the Umbral Collar Zealot ability.
6. Cast Kobolds of Kher Keep by paying 0.
7. Repeat.

This intricate loop relies on the zero-mana cost of Kobolds of Kher Keep to feed a relentless cycle of sacrifices and triggers. When you use Umbral Collar Zealot to sacrifice the Kobolds, both Mortuary and Remembrance intercept the death event: Mortuary places the creature back onto your library, while Remembrance exploits that exact same death to tutor another copy straight to your hand. Because the Kobolds cost nothing to cast, you can endlessly replay the card you just searched for, setting up an infinite engine of death triggers, enter-the-battlefield events, and surveil actions.