Shepherd of the Cosmos + Umbral Collar Zealot + Necrogen Communion

Shepherd of the Cosmos

Umbral Collar Zealot

Necrogen Communion

How it works

1. Activate Umbral Collar Zealot by sacrificing Shepherd of the Cosmos.
2. When Shepherd of the Cosmos dies, Necrogen Communion triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield.
3. When Shepherd of the Cosmos enters the battlefield, it triggers, returning Necrogen Communion from your graveyard to the battlefield attached to Shepherd of the Cosmos.
4. Resolve the Umbral Collar Zealot ability
5. Repeat.

This clever loop is held together by the recursion engine of Necrogen Communion, which ensures that whenever its enchanted creature dies, it immediately returns to the battlefield. By sacrificing Shepherd of the Cosmos to Umbral Collar Zealot, you trigger that very return, and because Shepherd of the Cosmos possesses its own enter-the-battlefield ability to pull a low-mana permanent back from the graveyard, it seamlessly brings Necrogen Communion right back along with it, reattaching itself to start the cycle anew. Meanwhile, Umbral Collar Zealot's sacrifice outlet lets you endlessly fuel the loop while constantly surveilling your library, generating infinite triggers for all your leaves-the-battlefield, enters-the-battlefield, and death needs.