Dualcaster Mage + Reunion of the House + Umbral Collar Zealot

Dualcaster Mage

Reunion of the House

Umbral Collar Zealot

How it works

1. Cast Reunion of the House by paying 5.
2. Holding priority, cast Dualcaster Mage by paying 1.
3. When Dualcaster Mage enters the battlefield, it triggers, targeting Reunion of the House.
4. Holding priority, activate Umbral Collar Zealot by sacrificing Dualcaster Mage.
5. Resolve the Dualcaster Mage trigger, copying Reunion of the House, targeting Dualcaster Mage and any other creature(s) as desired.
6. Resolve the copy of Reunion of the House, returning the targeted creatures from your graveyard to the battlefield.
7. Repeat from step 3.

This recursive loop relies on Dualcaster Mage copying Reunion of the House mid-air to constantly pull itself and other creatures right back out of your graveyard. To keep the engine running, Umbral Collar Zealot provides the crucial sacrifice outlet that sends Dualcaster Mage to the graveyard while letting you surveil through your library. Because Reunion of the House returns creatures with a total power of 10 or less and then exiles itself, the original copy disappears while the copied versions continually reanimate your board, generating infinite sacrifices, leaves-the-battlefield triggers, and enters-the-battlefield triggers.