Brotherhood Outcast + Umbral Collar Zealot + Unholy Indenture

Brotherhood Outcast

Umbral Collar Zealot

Unholy Indenture

How it works

1. Activate Umbral Collar Zealot by sacrificing Brotherhood Outcast.
2. When Brotherhood Outcast dies, Unholy Indenture triggers, returning Brotherhood Outcast from your graveyard to the battlefield.
3. When Brotherhood Outcast enters the battlefield, it triggers, returning Unholy Indenture from your graveyard to the battlefield attached to Brotherhood Outcast.
4. Resolve the Umbral Collar Zealot ability.
5. Repeat.

This recursive loop spins endlessly by continuously recycling its own pieces right out of the graveyard. It all starts when you use Umbral Collar Zealot to sacrifice Brotherhood Outcast, sending the Outcast to the graveyard while fueling your surveil triggers. Because Brotherhood Outcast was enchanted by Unholy Indenture beforehand, that Aura's triggered ability steps in upon death to bring the Outcast right back to the battlefield with a +1/+1 counter. Once returned, Brotherhood Outcast's enter-the-battlefield ability triggers to fish Unholy Indenture back out of the graveyard and attach it right back to the Outcast, setting the entire cycle up to repeat from the top.