Riverchurn Monument, and Traumatize

Prerequisites

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

Steps

1. Cast Traumatize by paying , causing a player to mill half their library, rounded up
2. Activate Riverchurn Monument's exhaust ability by paying and tapping it, causing each player to mill cards equal to the number of cards in their graveyard, thus causing the player targeted by Traumatize to mill the rest of their library

Results

• Infinite self-mill
• Infinite mill for target opponent