Roxanne, Starfall Savant, Basalt Monolith, and Artificer Class

Prerequisites

• Roxanne, Starfall Savant on the battlefield
• Basalt Monolith on the battlefield
• Artificer Class on the battlefield

Steps

1. At the beginning of your end step, Artificer Class triggers, creating a token copy of Basalt Monolith
2. Activate the token Basalt Monolith's first ability by tapping it, adding
3. Roxanne's second ability triggers, adding
4. Activate the token Basalt Monolith's second ability by paying , untapping it
5. Repeat from step 2

Results

• Infinite colorless mana