Myr Welder, Voltaic Construct, and Nyx Lotus

Prerequisites

• Myr Welder on the battlefield
• Voltaic Construct on the battlefield or in exile
• Nyx Lotus in exile

Steps

1. Activate Myr Welder using Nyx Lotus's ability by tapping it, adding at least three mana of any color you have devotion to
2. If Voltaic Construct is on the battlefield, activate Voltaic Construct by paying , untapping Myr Welder
3. Otherwise, activate Myr Welder using Voltaic Construct's ability by paying , untapping Myr Welder
4. Repeat

Results

• Infinite untap of artifact creatures you control
• Infinite mana of colors you have devotion to