Karmic Guide + Body Double + Phyrexian Altar

Karmic Guide

Body Double

Phyrexian Altar

How it works

1. Cast Body Double by paying 4, 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 Phyrexian Altar 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 Phyrexian Altar 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.