Tarrian's Soulcleaver, Scurry Oak, and Yahenni, Undying Partisan

Prerequisites

• Tarrian's Soulcleaver on the battlefield
• Scurry Oak on the battlefield
• Yahenni, Undying Partisan on the battlefield
• You have a way to put a +1/+1 counter on Scurry Oak

Steps

1. Put a +1/+1 counter on Scurry Oak
2. Scurry Oak triggers, creating a 1/1 Squirrel creature token
3. Activate Yahenni 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 Yahenni ability
7. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite +1/+1 counters on Scurry Oak