Wormfang Drake, Karmic Guide, and Phantom Train

Prerequisites

• Wormfang Drake in hand
• Karmic Guide on the battlefield
• Phantom Train on the battlefield
• available

Steps

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

Results

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