Mikaeus, the Unhallowed + Otherworldly Escort + Umbral Collar Zealot

Mikaeus, the Unhallowed

Otherworldly Escort

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Otherworldly Escort.
2. When Otherworldly Escort dies, it triggers, returning itself from your graveyard to the battlefield as a Spirit Detective.
3. Resolve the Umbral Collar Zealot ability.
4. Activate Umbral Collar Zealot by sacrificing Otherworldly Escort.
5. When Otherworldly Escort dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
6. Resolve the Umbral Collar Zealot ability.
7. Repeat.

This loop cleverly alternates between two different resurrection effects to let Otherworldly Escort enter the graveyard repeatedly without getting permanently locked out by its own counters. Umbral Collar Zealot acts as the engine, providing a repeatable sacrifice outlet that triggers the Escort's death triggers while fueling your board with infinite surveils. Meanwhile, Mikaeus, the Unhallowed provides the crucial passive undying buff for the second half of the loop, ensuring that even after the Escort has already used its own native transformation clause, it keeps coming right back for more.