Mikaeus, the Unhallowed, Umbral Collar Zealot, and Reluctant Dounguard

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Umbral Collar Zealot on the battlefield
• Reluctant Dounguard on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Reluctant Dounguard
2. When Reluctant Dounguard 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 Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite surveil