Voltaic Construct, Karn, Silver Golem, and Pyramid of the Pantheon

Prerequisites

• Voltaic Construct on the battlefield
• Karn, Silver Golem on the battlefield
• Pyramid of the Pantheon on the battlefield
• available

Steps

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

Results

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