Voltaic Construct, Does Machines, and Astral Cornucopia

Prerequisites

• Voltaic Construct on the battlefield
• Does Machines on the battlefield
• Astral Cornucopia on the battlefield

Steps

1. Animate Astral Cornucopia using Does Machines
2. Activate Astral Cornucopia by tapping it, adding at least three mana of any color
3. Activate Voltaic Construct by paying , untapping Astral Cornucopia
4. Repeat from step 2

Results

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