Voltaic Construct, Living Brain, Mechanical Marvel, and Nyx Lotus

Prerequisites

• Voltaic Construct on the battlefield
• Living Brain, Mechanical Marvel on the battlefield
• Nyx Lotus on the battlefield

Steps

1. Animate Nyx Lotus using Living Brain
2. Activate Nyx Lotus by tapping it, adding at least three mana of any color
3. Activate Voltaic Construct by paying , untapping Nyx Lotus
4. Repeat from step 2

Results

• Infinite untap of artifact creatures you control
• Infinite mana among colors with which you have devotion