Mikaeus, the Unhallowed + Slumbering Walker + Umbral Collar Zealot

WB identity

Commander legal

The 3 combo pieces

• Mikaeus, the Unhallowed
• Slumbering Walker
• Umbral Collar Zealot

How to execute it

1. Activate Umbral Collar Zealot by sacrificing Slumbering Walker.
2. When Slumbering Walker 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.

What the combo produces

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