Prosper, Tome-Bound + Eternal Scourge + Ashnod's Altar + Mimic Vat

Prosper, Tome-Bound

Eternal Scourge

Ashnod's Altar

Mimic Vat

How it works

1. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding CC.
2. Mimic Vat's imprint ability triggers, exiling Eternal Scourge and returning any previously exiled creatures to their owners' graveyards.
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.