Marvin, Murderous Mimic, Faeburrow Elder, and Morphling

Prerequisites

• Marvin, Murderous Mimic on the battlefield
• Faeburrow Elder on the battlefield
• Morphling on the battlefield

Steps

1. Activate Marvin using Faeburrow Elder's ability by tapping it, adding at least
2. Activate Marvin using Morphling's ability by paying , untapping it
3. Repeat

Results

• Infinite non-blue mana of colors among permanents you control
• Infinite black mana if you control a black permanent
• Infinite green mana
• Infinite red mana if you control a red permanent
• Infinite white mana