Ashnod's Altar + Mikaeus, the Unhallowed + Reaping Willow

WB identity

Commander legal

The 3 combo pieces

• Ashnod's Altar
• Mikaeus, the Unhallowed
• Reaping Willow

How to execute it

1. Activate Ashnod's Altar by sacrificing Reaping Willow.
2. When Reaping Willow 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. Repeat.

What the combo produces

• Infinite colorless mana
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers