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

Prerequisites

• Prosper, Tome-Bound on the battlefield
• Ugin, the Ineffable on the battlefield
• Eternal Scourge on the battlefield
• Mimic Vat on the battlefield
• Phyrexian Altar on the battlefield

Steps

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
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

Results

• Infinite colored mana
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers