Voltaic Construct, Mana Vault, and March of the Machines

Prerequisites

• Voltaic Construct on the battlefield
• Mana Vault on the battlefield
• March of the Machines on the battlefield
• Mana Vault does not have summoning sickness

Steps

1. Activate Mana Vault by tapping it, adding
2. Activate Voltaic Construct by paying , untapping Mana Vault
3. Repeat

Results

• Infinite colorless mana