Mortuary + Krark-Clan Ironworks + Augur of Autumn

Mortuary

Krark-Clan Ironworks

Augur of Autumn

How it works

1. Activate Krark-Clan Ironworks by sacrificing the nontoken creature, adding CC.
2. When the creature dies, Mortuary triggers, putting the creature from your graveyard onto the top of your library.
3. Cast the creature by paying its mana cost.
4. Repeat.

This ingenious loop turns a simple sacrifice engine into an endless cycle of life and death, provided you can fulfill the coven requirement to keep the creature spells flowing. When you feed a creature to Krark-Clan Ironworks for a burst of colorless mana, Mortuary immediately catches it on its way to the graveyard and slides it right back to the top of your library. With Augur of Autumn granting you the ability to cast creature spells from that very same top deck, you can simply replay the sacrificed creature using the mana you just generated. By weaving these three pieces together, you generate an endless storm of enters-the-battlefield, leaves-the-battlefield, and death triggers while keeping your mana supply fully fueled.