Marvin, Murderous Mimic, Pili-Pala, and Axebane Guardian

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Pili-Pala on the battlefield
• Axebane Guardian on the battlefield
• You control at least two creatures with defender
• Marvin does not have summoning sickness

Steps

1. Activate Marvin using Axebane Guardian'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