Basalt Monolith, March of the Machines, and Training Grounds

Prerequisites

• Basalt Monolith on the battlefield
• March of the Machines on the battlefield
• Training Grounds on the battlefield
• Basalt Monolith does not have summoning sickness

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