Voltaic Construct, Karn, Silver Golem, and White Lotus Tile

Prerequisites

• Voltaic Construct on the battlefield
• Karn, Silver Golem on the battlefield
• White Lotus Tile on the battlefield
• available

Steps

1. Animate White Lotus Tile using Karn
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