Metalworker, and Voltaic Construct

Prerequisites

• Metalworker on the battlefield
• Voltaic Construct on the battlefield
• You have at least two artifact cards in hand
• Metalworker does not have summoning sickness

Steps

1. Activate Metalworker by tapping it, revealing at least two artifact cards from your hand, and adding at least
2. Activate Voltaic Construct by paying , untapping Metalworker
3. Repeat

Results

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