Karmic Guide, Body Double, and Phantom Train

Prerequisites

• Karmic Guide in the graveyard
• Body Double in hand
• Phantom Train on the battlefield
• available

Steps

1. Cast Body Double by paying , choosing to have it enter the battlefield as a copy of Karmic Guide
2. When Body Double enters the battlefield, it triggers, targeting Karmic Guide
3. Holding priority, activate Phantom Train by sacrificing Body Double
4. Resolve the Body Double trigger, returning Karmic Guide from your graveyard to the battlefield
5. When Karmic Guide enters the battlefield, it triggers, targeting Body Double
6. Holding priority, activate Phantom Train by sacrificing Karmic Guide
7. Resolve the Karmic Guide trigger, returning Body Double from your graveyard to the battlefield as a copy of Karmic Guide
8. Repeat from step 2

Results

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