Tarrian's Soulcleaver + Herd Baloth + Altar of Dementia

Tarrian's Soulcleaver
Herd Baloth
Altar of Dementia

Requires
Tarrian's Soulcleaver must be on the battlefield (attached to Herd Baloth). Herd Baloth must be on the battlefield. Altar of Dementia must be on the battlefield. You have a way to put a +1/+1 counter on Herd Baloth.
Steps
  1. Put a +1/+1 counter on Herd Baloth.
  2. Herd Baloth triggers, creating a 4/4 Beast creature token.
  3. Activate Altar of Dementia 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 Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
  7. Repeat from step 3.
Results
Infinite LTB. Infinite ETB. Infinite sacrifice triggers. Infinite death triggers. Infinite mill. Infinite self-mill. Infinite +1/+1 counters on Herd Baloth.

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