Ultron, Artificial Malevolence, Voltaic Construct, and Coveted Jewel

Prerequisites

• Ultron, Artificial Malevolence on the battlefield
• Voltaic Construct on the battlefield
• Coveted Jewel in hand
• available

Steps

1. Cast Coveted Jewel by paying its mana cost
2. When Coveted Jewel enters, it and Ultron trigger
3. Resolve the Coveted Jewel trigger, causing you to draw three cards
4. Holding priority, activate Coveted Jewel by tapping it, adding three mana of any color
5. Resolve the Ultron trigger, causing you to pay to create a copy of Coveted Jewel that is a 2/2 Robot Villain creature
6. When the Coveted Jewel token enters, it triggers, causing you to draw three cards
7. During your next turn, activate the Coveted Jewel token by tapping it, adding three mana of any color Activate Voltaic Construct by paying , untapping the Coveted Jewel token
8. Repeat from step 7

Results

• Infinite colored mana