Voltaic Construct, Bighorner Rancher, and Memnarch

Prerequisites

• Voltaic Construct on the battlefield
• Bighorner Rancher on the battlefield
• Memnarch on the battlefield
• available

Steps

1. Cause Bighorner Rancher to become an artifact using Memnarch
2. Activate Bighorner Rancher by tapping it, adding at least
3. Activate Voltaic Construct by paying , untapping Bighorner Rancher
4. Repeat from step 2

Results

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