Marvin, Murderous Mimic, Pili-Pala, and Leafkin Druid

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Pili-Pala on the battlefield
• Leafkin Druid on the battlefield
• You control four or more creatures
• Marvin does not have summoning sickness

Steps

1. Activate Marvin using Leafkin Druid's ability by tapping it, 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