Prosper, Tome-Bound + Ugin, the Ineffable + Eternal Scourge + Mimic Vat + Phyrexian Altar

Prosper, Tome-Bound

Ugin, the Ineffable

Eternal Scourge

Mimic Vat

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Eternal Scourge, adding one mana of any color.
2. Mimic Vat triggers, exiling Eternal Scourge from your graveyard and returning any previously exiled creatures to their owners' graveyards.
3. Cast Eternal Scourge for 1.
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.