Archon of Falling Stars + Gift of Immortality + Phyrexian Altar

Archon of Falling Stars

Gift of Immortality

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Archon of Falling Stars, adding one mana of any color.
2. Archon of Falling Stars dies, triggering itself and Gift of Immortality.
3. Resolve the Gift of Immortality trigger, returning Archon of Falling Stars from your graveyard to the battlefield.
4. Resolve the Archon of Falling Stars trigger, returning Gift of Immortality from your graveyard to the battlefield attached to Archon of Falling Stars.
5. Repeat.