Mikaeus, the Unhallowed + Phantom Train + Plague Belcher

B identity

Commander legal

The 3 combo pieces

• Mikaeus, the Unhallowed
• Phantom Train
• Plague Belcher

How to execute it

1. Activate Phantom Train by sacrificing Plague Belcher.
2. When Plague Belcher dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When Plague Belcher enters the battlefield, it triggers, putting a -1/-1 counter on it.
4. Resolve the Phantom Train ability
5. Repeat.

What the combo produces

• Infinite +1/+1 counters on a creature
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers