Marvin, Murderous Mimic, Morphling, and Ilysian Caryatid

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Morphling on the battlefield
• Ilysian Caryatid on the battlefield
• You control a creature with power 4 or greater
• Marvin does not have summoning sickness

Steps

1. Activate Marvin using Ilysian Caryatid's ability by tapping it, adding
2. Activate Marvin using Morphling's ability by paying , untapping it
3. Repeat

Results

• Infinite colored mana