Voltaic Construct, Toymaker, and Coveted Jewel

Prerequisites

• Voltaic Construct on the battlefield
• Toymaker on the battlefield
• Coveted Jewel on the battlefield
• available

Steps

1. Animate Coveted Jewel using Toymaker
2. Activate Coveted Jewel by tapping it, adding three mana of any color Activate Voltaic Construct by paying , untapping Coveted Jewel
3. Repeat from step 2

Results

• Infinite colored mana
• Infinite untap of artifact creatures you control