Saffi Eriksdotter + Karmic Guide + Phantom Train

Saffi Eriksdotter

Karmic Guide

Phantom Train

How it works

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