Voltaic Construct, Gilded Lotus, and Karn, Silver Golem

Prerequisites

• Voltaic Construct on the battlefield
• Gilded Lotus on the battlefield
• Karn, Silver Golem on the battlefield
• Gilded Lotus does not have summoning sickness
• available

Steps

1. Activate Karn by paying , causing Gilded Lotus to become an artifact creature until end of turn
2. Activate Gilded Lotus by tapping it, adding three mana of any one color
3. Activate Voltaic Construct by paying , untapping Gilded Lotus
4. Repeat from step 2

Results

• Infinite colored mana