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

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Pili-Pala on the battlefield
• Incubation Druid on the battlefield
• Marvin does not have summoning sickness and has a +1/+1 counter on it
• You control a mana-producing land

Steps

1. Activate Marvin using Incubation Druid's ability by tapping it, adding three mana of any type a land you control can produce
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 mana lands you control can produce