Voltaic Construct, Coveted Jewel, and Workshop Elders

Prerequisites

• Voltaic Construct on the battlefield
• Coveted Jewel on the battlefield
• Workshop Elders on the battlefield
• Coveted Jewel does not have summoning sickness

Steps

1. At the beginning of your combat phase, Workshop Elders triggers, causing Coveted Jewel to become an artifact creature
2. Activate Coveted Jewel by tapping it, adding three mana of any one color
3. Activate Voltaic Construct by paying , untapping Coveted Jewel
4. Repeat from step 2

Results

• Infinite colored mana