Crystalline Crawler + Maester Seymour + Najeela, the Blade-Blossom

WUBRG identity

Commander legal

The 3 combo pieces

How to execute it

  1. At the beginning of your combat phase, Maester Seymour triggers, putting at least five +1/+1 counters on Crystalline Crawler.
  2. Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters from it, adding {W}{U}{B}{R}{G}.
  3. Activate Najeela by paying {W}{U}{B}{R}{G}, untapping all attacking creatures you control and causing you to get an additional combat phase after this one.
  4. Repeat.

What the combo produces