Berta, Wise Extrapolator + Donatello, the Brains + Summoning Station

Mana needed: {1}

GU identity

Commander legal

The 3 combo pieces

How to execute it

  1. Activate Summoning Station by tapping it, creating a 2/2 Pincher creature token and a Mutagen token due to Donatello.
  2. Activate the Mutagen by paying {1}, tapping and sacrificing it.
  3. Summoning Station triggers, untapping it.
  4. Resolve the Mutagen ability, putting a +1/+1 counter on Berta.
  5. Berta triggers, adding {1}.
  6. Repeat.

What the combo produces