Voltaic Construct, Mana Vault, and Workshop Elders

Prerequisites

• Voltaic Construct on the battlefield
• Mana Vault on the battlefield
• Workshop Elders on the battlefield
• Mana Vault does not have summoning sickness

Steps

1. At the beginning of your combat phase, Workshop Elders triggers, causing Mana Vault to become an artifact creature
2. Activate Mana Vault by tapping it, adding
3. Activate Voltaic Construct by paying , untapping Mana Vault
4. Repeat from step 2

Results

• Infinite colorless mana