Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Phantom Train, and Mikey & Mona, Mutant Sitters

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Phantom Train on the battlefield
• Mikey & Mona, Mutant Sitters on the battlefield

Steps

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

Results

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