Dauthi Voidwalker + Helm of Obedience

Dauthi Voidwalker
Helm of Obedience

Requires
Dauthi Voidwalker must be on the battlefield. Helm of Obedience must be on the battlefield. Mana needed: 1
Steps
  1. Activate Helm of Obedience by paying 1 and tapping it, causing an opponent to mill the card.
  2. The card is exiled instead of being put into the opponent's graveyard due to Dauthi Voidwalker, which causes the process from Helm of Obedience to continue until the opponent has exiled their entire library.
Results
Exile target opponent's library.