Katsumasa, the Animator, and Voltaic Construct

Prerequisites

• Katsumasa, the Animator on the battlefield
• Voltaic Construct on the battlefield
• You control a noncreature artifact that does not have summoning sickness and can tap to produce at least
• available

Steps

1. Activate the mana-producing artifact by tapping it, adding at least
2. Activate Katsumasa by paying , causing the mana-producing artifact to become a 1/1 artifact creature until end of turn
3. Activate Voltaic Construct by paying , untapping the artifact
4. Activate the mana-producing artifact by tapping it, adding at least
5. Repeat from step 3

Results

• Infinite mana artifacts you control can produce
• Infinite untap of artifacts you control