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

Tarrian's Soulcleaver
Scurry Oak
Yahenni, Undying Partisan

Requires
Tarrian's Soulcleaver must be on the battlefield (attached to Scurry Oak). Scurry Oak must be on the battlefield. Yahenni, Undying Partisan must be 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.

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