Wilhelt, the Rotcleaver + Poppet Stitcher + Altar of Dementia

Wilhelt, the Rotcleaver
Poppet Stitcher
Altar of Dementia

Requires
All permanents on the battlefield. Poppet Stitcher on the battlefield as Poppet Factory. You control at least one Zombie creature.
Steps
  1. Activate Altar of Dementia by sacrificing a Zombie creature
  2. Wilhelt triggers, creating a 2/2 Zombie token
  3. Resolve the Altar of Dementia ability, milling target player for a number of cards equal to the power of the sacrificed creature
  4. Repeat
Results
Infinite mill. Infinite ETB. Infinite death triggers. Infinite sacrifice triggers. Infinite LTB.