Marvin, Murderous Mimic, Pili-Pala, and Vhal, Candlekeep Researcher

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Pili-Pala on the battlefield
• Vhal, Candlekeep Researcher on the battlefield

Steps

1. Activate Marvin using Vhal's ability by tapping it, adding at least that cannot be spent to cast spells from your hand
2. Activate Marvin using Pili-Pala's ability by paying and untapping it, adding one mana of any color
3. Repeat

Results

• Infinite colored mana
• Infinite colorless mana that cannot be spent to cast spells from your hand