Helm of Obedience + Leyline of the Void

Helm of Obedience
Leyline of the Void

Requires
All permanents on the battlefield. 1 available.
Steps
  1. Activate Helm of Obedience by paying 1 and tapping, causing target player to mill a card until a creature card is put into their graveyard this way
  2. Any cards put into the graveyard by Helm of Obedience is exiled
Results
Infinite mill for target opponent