Voltaic Construct, Gilded Lotus, and Xenic Poltergeist

Prerequisites

• Voltaic Construct on the battlefield
• Gilded Lotus on the battlefield
• Xenic Poltergeist on the battlefield
• Xenic Poltergeist does not have summoning sickness
• Gilded Lotus does not have summoning sickness

Steps

1. Activate Xenic Poltergeist by tapping it, causing Gilded Lotus to become an artifact creature until your next upkeep
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