Biomancer's Familiar + Ensoul Artifact + Grim Monolith

GU identity

Commander legal

The 3 combo pieces

• Biomancer's Familiar
• Ensoul Artifact
• Grim Monolith

What must be in place

Ensoul Artifact attached to Grim Monolith.
Grim Monolith does not have summoning sickness.

How to execute it

1. Activate Grim Monolith's first ability by tapping it, adding {C}{C}{C}.
2. Activate Grim Monolith's second ability by paying {2}, untapping it.
3. Repeat.

What the combo produces

• Infinite colorless mana