Phenax, God of Deception, Sewer Nemesis, and Traumatize

Prerequisites

• Phenax, God of Deception on the battlefield
• Sewer Nemesis on the battlefield
• Traumatize in hand
• undefined available

Steps

1. Cast Traumatize by paying , causing the player named by Sewer Nemesis to mill half their library, rounded down
2. Activate Sewer Nemesis by tapping it, causing the player to mill cards equal to the cards in their graveyard, likely milling the remainder of their library

Results

• Infinite self-mill
• Infinite mill for target opponent