Coveted Jewel + March of the Machines + Voltaic Construct

U identity

Commander legal

The 3 combo pieces

• Coveted Jewel
• March of the Machines
• Voltaic Construct

How to execute it

1. Activate Coveted Jewel by tapping it, adding three mana of any color
2. Activate Voltaic Construct by paying {2}, untapping Coveted Jewel.
3. Repeat

What the combo produces

• Infinite colored mana
• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control