Battlemage's Bracers, Tidewater Minion, and Bighorner Rancher

Prerequisites

• Battlemage's Bracers on the battlefield
• Tidewater Minion on the battlefield
• Bighorner Rancher on the battlefield

Steps

1. Activate Bighorner Rancher by tapping it, adding at least Activate Tidewater Minion by tapping it, targeting Bighorner Rancher
2. Battlemage's Bracers triggers, causing you to pay to copy Tidewater Minion's ability, targeting Tidewater Minion
3. Resolve both Tidewater Minion abilities, untapping it and Bighorner Rancher
4. Repeat

Results

• Infinite green mana
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control