Maddening Cacophony, and Keening Stone

Prerequisites

• Maddening Cacophony in hand
• Keening Stone on the battlefield
• undefined available

Steps

1. Cast Maddening Cacophony with kicker by paying , causing each opponent to mill half their library, rounded up
2. Activate Keening Stone by paying and tapping it, causing an opponent to mill cards equal to the number of cards in their graveyard, thus milling the rest of their library

Results

• Infinite mill for target opponent
• Near-infinite mill