Urban Daggertooth, Herd Baloth, and Pandemonium

Prerequisites

• Urban Daggertooth on the battlefield
• Herd Baloth on the battlefield
• Pandemonium on the battlefield
• You have a way to give Urban Daggertooth indestructible
• You have a way to put a +1/+1 counter on Herd Baloth

Steps

1. Give Urban Daggertooth indestructible
2. Put a +1/+1 counter on Herd Baloth
3. Herd Baloth triggers, creating a 4/4 Beast creature token
4. The Beast enters the battlefield, triggering Pandemonium, dealing 4 damage to Urban Daggertooth
5. Urban Daggertooth triggers, putting a +1/+1 counter on Herd Baloth
6. Repeat from step 3

Results

• Infinite +1/+1 counters on Herd Baloth and Urban Daggertooth
• Infinite creature tokens
• Infinite ETB
• Infinite proliferate