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

Prerequisites

• Donatello, the Brains on the battlefield
• Summoning Station on the battlefield
• Berta, Wise Extrapolator on the battlefield
• available

Steps

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 , 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
6. Repeat

Results

• Infinite +1/+1 counters on creatures you control
• Infinite ETB
• Infinite creature tokens