Marvin, Murderous Mimic + Mona Lisa, Science Geek + Morphling

GU identity

Commander legal

The 3 combo pieces

• Marvin, Murderous Mimic
• Mona Lisa, Science Geek
• Morphling

How to execute it

1. Activate Marvin using Mona Lisa's ability by tapping it, adding an amount of colored mana equal to Marvin's power.
2. Activate Marvin using Morphling's ability by paying {U}, untapping it.
3. Repeat.

What the combo produces

• Infinite colored mana