Saffi Eriksdotter, Phantom Train, and Metamorphosis Fanatic

Prerequisites

• Saffi Eriksdotter on the battlefield
• Phantom Train on the battlefield
• Metamorphosis Fanatic in hand

Steps

1. Activate Saffi by sacrificing it, targeting Metamorphosis Fanatic Activate Phantom Train by sacrificing Metamorphosis Fanatic When Metamorphosis Fanatic dies, Saffi triggers, returning Metamorphosis Fanatic from your graveyard to the battlefield
2. When Metamorphosis Fanatic 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