Tarrian's Soulcleaver, Herd Baloth, and Umbral Collar Zealot

Prerequisites

• Tarrian's Soulcleaver on the battlefield
• Herd Baloth on the battlefield
• Umbral Collar Zealot on the battlefield

Steps

1. Put a +1/+1 counter on Herd Baloth
2. Herd Baloth triggers, creating a 4/4 Beast creature token
3. Activate Umbral Collar Zealot by sacrificing the Beast
4. When the Beast dies, Tarrian's Soulcleaver triggers, putting a +1/+1 counter on Herd Baloth
5. Herd Baloth triggers, creating a 4/4 Beast creature token
6. Resolve the Umbral Collar Zealot ability, putting a +1/+1 counter on it
7. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Herd Baloth
• Infinite surveil 1