Phyrexian Altar + Icewind Stalwart + Karmic Guide

Phyrexian Altar

Icewind Stalwart

Karmic Guide

How it works

1. Cast Icewind Stalwart by paying its mana cost.
2. When Icewind Stalwart enters the battlefield, it triggers, targeting Karmic Guide
3. Holding priority, activate Phyrexian Altar by sacrificing Icewind Stalwart.
4. Resolve the Icewind Stalwart ability, blinking Karmic Guide
5. When Karmic Guide enters, it triggers, returning Icewind Stalwart from your graveyard to the battlefield.
6. Repeat from step 2.