Voltaic Construct, Bighorner Rancher, and Ashnod's Transmogrant

Prerequisites

• Voltaic Construct on the battlefield
• Bighorner Rancher on the battlefield
• Ashnod's Transmogrant on the battlefield

Steps

1. Cause Bighorner Rancher to become an artifact using Ashnod's Transmogrant
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