Zirda, the Dawnwaker + Basalt Monolith

Zirda, the Dawnwaker
Basalt Monolith

Requires
All permanents on the battlefield.
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.