Voltaic Construct, Time Vault, and Karn, the Great Creator

Prerequisites

• Voltaic Construct on the battlefield
• Time Vault on the battlefield
• Karn, the Great Creator on the battlefield
• each turn available

Steps

1. Activate Karn's +2 ability, turning Time Vault into a 1/1 creature until end of turn
2. Activate Voltaic Construct for , untapping Time Vault
3. Tap Time Vault to take an extra turn after this one
4. Repeat for infinite turns

Results

• Infinite turns