Helm of Obedience, and Leyline of the Void

Prerequisites

• Helm of Obedience on the battlefield
• Leyline of the Void on the battlefield
• available

Steps

1. Activate Helm of Obedience by paying 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