Activate Phyrexian Altar by sacrificing Archon of Falling Stars, adding one mana of any color.
When Archon of Falling Stars dies, it triggers, returning Dance of the Dead from your graveyard to the battlefield.
When Dance of the Dead enters the battlefield, it triggers, returning Archon of Falling Stars from your graveyard to the battlefield, and attaching Dance of the Dead to it.
Repeat.
This delightful loop creates an endless cycle of sacrifice and resurrection, fueled by Phyrexian Altar to turn your creatures into a river of infinite colored mana and death triggers. The engine hums along because Archon of Falling Stars uses its dying breath to pull Dance of the Dead out of the graveyard, and that very same Aura immediately returns the Archon to the battlefield upon arrival to start the cycle anew.