Crystalline Crawler + Pemmin's Aura + Steel Overseer

U identity

Commander legal

The 3 combo pieces

What must be in place

Pemmin's Aura attached to Steel Overseer.
Steel Overseer does not have summoning sickness.

How to execute it

  1. Activate Steel Overseer by tapping it, putting a +1/+1 counter on each artifact creature you control.
  2. Activate Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding {U}.
  3. Activate Pemmin's Aura's first ability by paying {U}, untapping Steel Overseer.
  4. Repeat.

What the combo produces