Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight, Morselhoarder, and Phantom Train

Prerequisites

• Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight on the battlefield
• Morselhoarder on the battlefield
• Phantom Train on the battlefield

Steps

1. If Morselhoarder has any -1/-1 counters on it, activate it by removing a -1/-1 counter from it, adding one mana of any color
2. Repeat step 1 as necessary until Morselhoarder has no -1/-1 counters on it
3. Activate Phantom Train by sacrificing Morselhoarder
4. When Morselhoarder dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
5. Resolve the Phantom Train ability
6. Repeat

Results

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