Power Artifact + Basalt Monolith

Power Artifact
Basalt Monolith

Requires
All permanents on the battlefield. Power Artifact attached to Basalt Monolith.
Steps
  1. Activate Basalt Monolith's first ability by tapping it, adding ccc
  2. Activate Basalt Monolith's last ability by paying 1, untapping it
  3. Repeat
Results
Infinite colorless mana.