Phantom Train, Wormfang Drake, and Metamorphosis Fanatic

Prerequisites

• Phantom Train on the battlefield
• Wormfang Drake in hand
• Metamorphosis Fanatic on the battlefield
• available

Steps

1. Cast Wormfang Drake by paying its mana cost
2. When Wormfang Drake enters, its first ability triggers, exiling Metamorphosis Fanatic
3. Activate Phantom Train by sacrificing Wormfang Drake
4. When Wormfang Drake dies, its second ability triggers, returning Metamorphosis Fanatic from exile to the battlefield
5. When Metamorphosis Fanatic enters, it triggers, returning Wormfang Drake from your graveyard to the battlefield
6. When Wormfang Drake enters, its first ability triggers, exiling Metamorphosis Fanatic
7. Resolve the Phantom Train ability
8. Repeat from step 3

Results

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