Ashiok, Wicked Manipulator + Necropotence

Ashiok, Wicked Manipulator
Necropotence

Requires
Ashiok, Wicked Manipulator must be on the battlefield. Necropotence must be on the battlefield.
Steps
  1. Activate Necropotence by exiling the top card of your library due to Ashiok, exiling the top card of your library.
  2. Repeat.
Results
Exile your library.