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

Prerequisites

• Prosper, Tome-Bound on the battlefield
• Eternal Scourge on the battlefield
• Ashnod's Altar on the battlefield
• Planar Void on the battlefield
• available

Steps

1. Activate Ashnod's Altar by sacrificing Eternal Scourge, adding
2. Planar Void triggers, exiling Eternal Scourge from your graveyard
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 ETB
• Infinite LTB
• Infinite sacrifice triggers