Riverchurn Monument, and Maddening Cacophony

Prerequisites

• Riverchurn Monument on the battlefield
• Maddening Cacophony in hand
• You have not activated Riverchurn Monument's exhaust ability
• available

Steps

1. Cast Maddening Cacophony with kicker by paying , causing each opponent to mill half their library, rounded up
2. Activate Riverchurn Monument's exhaust ability by paying and tapping it, causing each opponent to mill the remainder of their library

Results

• Infinite mill