Ayula, Queen Among Bears, Herd Baloth, and Artificial Evolution

Prerequisites

• Ayula, Queen Among Bears on the battlefield
• Herd Baloth in hand
• Artificial Evolution in hand
• available

Steps

1. Cast Artificial Evolution by paying , changing all instances of "Bear" on Ayula to "Beast" Cast Herd Baloth by paying
2. When Herd Baloth enters the battlefield, Ayula triggers, putting two +1/+1 counters on Herd Baloth
3. Herd Baloth triggers, creating a 4/4 Beast creature token
4. When the Beast enters the battlefield, Ayula triggers, putting two +1/+1 counters on Herd Baloth
5. Repeat from step 4

Results

• Infinite ETB
• Infinite creature tokens
• Infinite +1/+1 counters on Herd Baloth