Voltaic Construct, Karn, Silver Golem, and Bag End Banquet

Prerequisites

• Voltaic Construct on the battlefield
• Karn, Silver Golem on the battlefield
• Bag End Banquet on the battlefield
• available

Steps

1. Animate Bag End Banquet using Karn
2. Activate Bag End Banquet by tapping it, adding Activate Voltaic Construct by paying , untapping Bag End Banquet
3. Repeat from step 2

Results

• Infinite colorless mana
• Infinite untap of artifact creatures you control