Basalt Monolith + Karn, the Great Creator + Training Grounds

U identity

Commander legal

The 3 combo pieces

• Basalt Monolith
• Karn, the Great Creator
• Training Grounds

What must be in place

Basalt Monolith does not have summoning sickness.

How to execute it

1. Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Basalt Monolith to become an artifact creature until end of turn.
2. Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
3. Activate Basalt Monolith's second ability by paying {1}, untapping it.
4. Repeat.

What the combo produces

• Infinite colorless mana