Voltaic Construct, Karn, the Great Creator, and White Lotus Tile

Prerequisites

• Voltaic Construct on the battlefield
• Karn, the Great Creator on the battlefield
• White Lotus Tile on the battlefield

Steps

1. Animate White Lotus Tile using Karn, the Great Creator
2. Activate White Lotus Tile by tapping it, adding at least three mana of any color
3. Activate Voltaic Construct by paying , untapping White Lotus Tile
4. Repeat from step 2

Results

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