Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phantom Train + Stormbound Geist

WUB identity

Commander legal

The 3 combo pieces

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight
• Phantom Train
• Stormbound Geist

How to execute it

1. Activate Phantom Train by sacrificing Stormbound Geist
2. When Stormbound Geist dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Activate Phantom Train by sacrificing Stormbound Geist
4. When Stormbound Geist dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. Resolve both Phantom Train abilities from step 1 and 3.
6. Repeat.

What the combo produces

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