Mortuary + Bolas's Citadel + Yahenni, Undying Partisan + Kobolds of Kher Keep

Mortuary

Bolas's Citadel

Yahenni, Undying Partisan

Kobolds of Kher Keep

How it works

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

This elegant loop turns the zero-mana cost of Kobolds of Kher Keep into an unstoppable engine of sacrifice and rebirth. Because Bolas's Citadel allows you to play spells directly from the top of your library by paying life instead of mana, you can recast the kobold for free—a cost of zero life—the moment Mortuary puts it right back on top of your library after it hits the graveyard. To keep the cycle going, you feed the kobold to Yahenni, Undying Partisan's sacrifice ability, generating an endless stream of triggers that can easily flood the battlefield or skyrocket your storm count.