Junji, the Midnight Sky, Metamorphosis Fanatic, Phantom Train, and Sultai Flayer

Prerequisites

• Junji, the Midnight Sky on the battlefield
• Metamorphosis Fanatic on the battlefield
• Phantom Train on the battlefield
• Sultai Flayer on the battlefield

Steps

1. Activate Phantom Train by sacrificing Metamorphosis Fanatic
2. When Metamorphosis Fanatic dies, Sultai Flayer triggers, causing you to gain 4 life
3. Resolve the Phantom Train ability
4. Activate Phantom Train by sacrificing Junji
5. When Junji dies, it and Sultai Flayer trigger
6. Resolve the Sultai Flayer trigger, causing you to gain 4 life
7. Resolve the Junji trigger, returning Metamorphosis Fanatic from your graveyard to the battlefield and causing you to lose 2 life
8. When Metamorphosis Fanatic enters, it triggers, returning Junji from your graveyard to the battlefield
9. Resolve the Phantom Train ability
10. Repeat

Results

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