Myr Welder, Voltaic Construct, and Empowered Autogenerator

Prerequisites

• Myr Welder on the battlefield
• Voltaic Construct on the battlefield or in exile
• Empowered Autogenerator in exile
• available

Steps

1. Activate Myr Welder using Empowered Autogenerator's ability by tapping it, putting a charge counter on it and adding one mana of any color for each charge counter on it
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 colored mana
• Infinite untap of artifact creatures you control