Prosper, Tome-Bound + Eternal Scourge + Ashnod's Altar + Planar Void

Prosper, Tome-Bound

Eternal Scourge

Ashnod's Altar

Planar Void

How it works

1. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding CC.
2. Planar Void triggers, exiling Eternal Scourge from your graveyard.
3. Cast Eternal Scourge for 3.
4. Prosper triggers, creating a Treasure token.
5. Resolve Eternal Scourge, allowing it to enter the battlefield.
6. Activate the Treasure token by tapping and sacrificing it, adding one mana of any color.
7. Repeat.