Voltaic Construct, Faeburrow Elder, and Thran Forge

Prerequisites

• Voltaic Construct on the battlefield
• Faeburrow Elder on the battlefield
• Thran Forge on the battlefield
• available

Steps

1. Cause Faeburrow Elder to become an artifact using Thran Forge
2. Activate Faeburrow Elder by tapping it, adding at least Activate Voltaic Construct by paying , untapping Faeburrow Elder
3. Repeat from step 2

Results

• Infinite mana of colors among permanents you control
• Infinite untap of artifact creatures you control