Marvin, Murderous Mimic, Pili-Pala, and Metalworker

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Pili-Pala on the battlefield
• Metalworker on the battlefield
• You have at least one artifact card in hand
• Marvin does not have summoning sickness

Steps

1. Activate Marvin using Metalworker's ability by tapping it, revealing an artifact card from your hand and adding
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