Doomsday Excruciator, and Maddening Cacophony

Prerequisites

• Doomsday Excruciator in hand
• Maddening Cacophony in hand
• available

Steps

1. Cast Doomsday Excruciator by paying
2. When Doomsday Excruciator enters, it triggers, causing each player to exile all but the bottom six cards of their library
3. Cast Maddening Cacophony by paying , causing each opponent to mill the rest of their library

Results

• Infinite mill
• Near-infinite self-mill