Chaos Spewer + Mikaeus, the Unhallowed + Phantom Train

BR identity

Commander legal

The 3 combo pieces

• Chaos Spewer
• Mikaeus, the Unhallowed
• Phantom Train

How to execute it

1. Activate Phantom Train by sacrificing Chaos Spewer.
2. When Chaos Spewer dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When Chaos Spewer 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