Tarrian's Soulcleaver, Scurry Oak, and Umbral Collar Zealot

Prerequisites

• Tarrian's Soulcleaver on the battlefield
• Scurry Oak on the battlefield
• Umbral Collar Zealot on the battlefield

Steps

1. Put a +1/+1 counter on Scurry Oak
2. Scurry Oak triggers, creating a 1/1 Squirrel creature token
3. Activate Umbral Collar Zealot by sacrificing the Squirrel
4. When the Squirrel dies, Tarrian's Soulcleaver triggers, putting a +1/+1 counter on Scurry Oak
5. Scurry Oak triggers, creating a 1/1 Squirrel 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 Scurry Oak
• Infinite surveil 1