Mikaeus, the Unhallowed, Umbral Collar Zealot, and Morselhoarder

Prerequisites

• Mikaeus, the Unhallowed on the battlefield
• Umbral Collar Zealot on the battlefield
• Morselhoarder on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Morselhoarder
2. When Morselhoarder 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 colored mana
• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinite surveil