Mikaeus, the Unhallowed + Grim Poppet + Umbral Collar Zealot

Mikaeus, the Unhallowed

Grim Poppet

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Grim Poppet.
2. When Grim Poppet dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to its replacement effect.
3. Resolve the Umbral Collar Zealot ability
4. Repeat.

This clever loop revolves around the synergy between Mikaeus, the Unhallowed and Grim Poppet, turning the puppet's own mechanics against itself in a delightful alchemical cycle. Because Mikaeus grants undying to your non-Human creatures, sacrificing Grim Poppet to Umbral Collar Zealot triggers its return to the battlefield with a fresh slate, completely clearing away any lingering counters. While the provided steps show this sacrifice-and-return engine in motion, Umbral Collar Zealot's sacrifice outlet is what continuously feeds the loop while letting you surveil through your library. The result is an endless cascade of leaves-the-battlefield, enters-the-battlefield, and death triggers, fueling whatever payoff you might need.