Bifur, Melodic Rider + Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phantom Train

RWB identity

Commander legal

The 3 combo pieces

• Bifur, Melodic Rider
• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
• Phantom Train

How to execute it

1. Activate Phantom Train by sacrificing Bifur.
2. When Bifur dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Bifur enters, 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 most creatures you control
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers