Ultron, Artificial Malevolence, Voltaic Construct, and Prismatic Geoscope

Prerequisites

• Ultron, Artificial Malevolence on the battlefield
• Voltaic Construct on the battlefield
• Prismatic Geoscope in hand
• available

Steps

1. Cast Prismatic Geoscope by paying its mana cost
2. When Prismatic Geoscope enters, Ultron triggers, causing you to pay to create a copy of Prismatic Geoscope that is a 2/2 Robot Villain creature
3. During your next turn, activate the Prismatic Geoscope token by tapping it, adding one mana of any color for each basic land type among lands you control Activate Voltaic Construct by paying , untapping the Prismatic Geoscope token
4. Repeat from step 3

Results

• Infinite colored mana