Power Artifact, and Basalt Monolith

Prerequisites

• Power Artifact on the battlefield
• Basalt Monolith on the battlefield
• Power Artifact attached to Basalt Monolith

Steps

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

Results

• Infinite colorless mana