Roxanne, Starfall Savant, Basalt Monolith, and Mirrorworks

Prerequisites

• Roxanne, Starfall Savant on the battlefield
• Basalt Monolith in hand
• Mirrorworks on the battlefield
• available

Steps

1. Cast Basalt Monolith by paying
2. When Basalt Monolith enters the battlefield, Mirrorworks triggers, causing you to pay to create a token copy of Basalt Monolith
3. Activate the token Basalt Monolith's first ability by tapping it, adding
4. Roxanne's second ability triggers, adding
5. Activate the token Basalt Monolith's second ability by paying , untapping it
6. Repeat from step 3

Results

• Infinite colorless mana