Mighty Mutanimals, and Herd Baloth

Prerequisites

• Mighty Mutanimals in hand
• Herd Baloth on the battlefield
• available

Steps

1. Cast Mighty Mutanimals by paying
2. When Mighty Mutanimals enters, its first ability triggers, creating a 2/2 Mutant creature token
3. When the Mutant enters, Mighty Mutanimals' second ability triggers, putting a +1/+1 counter on Herd Baloth
4. Herd Baloth triggers, creating a creature token
5. When the creature token enters, Mighty Mutanimals' second ability triggers, putting a +1/+1 counter on Herd Baloth
6. Repeat from step 4

Results

• Infinite +1/+1 counters on a creature
• Infinite ETB
• Infinite creature tokens