Voltaic Construct, Faeburrow Elder, and Ashnod's Transmogrant

Prerequisites

• Voltaic Construct on the battlefield
• Faeburrow Elder on the battlefield
• Ashnod's Transmogrant on the battlefield

Steps

1. Cause Faeburrow Elder to become an artifact using Ashnod's Transmogrant
2. Activate Faeburrow Elder by tapping it, adding at least
3. Activate Voltaic Construct by paying , untapping Faeburrow Elder
4. Repeat from step 2

Results

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