Basalt Monolith, Ensoul Artifact, and Biomancer's Familiar

Prerequisites

• Basalt Monolith on the battlefield
• Ensoul Artifact on the battlefield
• Biomancer's Familiar on the battlefield
• Ensoul Artifact attached to Basalt Monolith
• Basalt Monolith does not have summoning sickness

Steps

1. Activate Basalt Monolith's first ability by tapping it, adding
2. Activate Basalt Monolith's second ability by paying , untapping it
3. Repeat

Results

• Infinite colorless mana