Voltaic Construct, Karn, Silver Golem, and Sceptre of Eternal Glory

Prerequisites

• Voltaic Construct on the battlefield
• Karn, Silver Golem on the battlefield
• Sceptre of Eternal Glory on the battlefield
• available

Steps

1. Animate Sceptre of Eternal Glory using Karn
2. Activate Sceptre of Eternal Glory by tapping it, adding three mana of any color Activate Voltaic Construct by paying , untapping Sceptre of Eternal Glory
3. Repeat from step 2

Results

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