Phenax, God of Deception, Sewer Nemesis, and Maddening Cacophony

Prerequisites

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

Steps

1. Cast Maddening Cacophony with kicker by paying , causing the opponent named by Sewer Nemesis to mill half their library, rounded up
2. Activate Sewer Nemesis by tapping it, causing the opponent to mill cards equal to the cards in their graveyard, milling the remainder of their library

Results

• Infinite mill for target opponent
• Near-infinite mill