Grim Monolith + Karn, the Great Creator + Voltaic Construct

C identity

Commander legal

The 3 combo pieces

• Grim Monolith
• Karn, the Great Creator
• Voltaic Construct

How to execute it

1. Animate Grim Monolith using Karn, the Great Creator.
2. Activate Grim Monolith by tapping it, adding {C}{C}{C}.
3. Activate Voltaic Construct by paying {2}, untapping Grim Monolith.
4. Repeat from step 2.

What the combo produces

• Infinite colorless mana
• Infinite untap of artifact creatures you control