Saffi Eriksdotter, Karmic Guide, and Phantom Train

Prerequisites

• Saffi Eriksdotter on the battlefield
• Karmic Guide in hand
• Phantom Train on the battlefield

Steps

1. Activate Saffi by sacrificing it, targeting Karmic Guide Activate Phantom Train by sacrificing Karmic Guide When Karmic Guide dies, Saffi triggers, returning Karmic Guide from your graveyard to the battlefield
2. When Karmic Guide enters, it triggers, returning Saffi from your graveyard to the battlefield
3. Resolve the Phantom Train ability
4. Repeat

Results

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