Marvin, Murderous Mimic, Pili-Pala, and Sanctum Weaver

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Pili-Pala on the battlefield
• Sanctum Weaver on the battlefield
• You control at least two enchantments
• Marvin does not have summoning sickness

Steps

1. Activate Marvin using Sanctum Weaver's ability by tapping it, adding at least two mana of any color
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