Riverchurn Monument, and Cut Your Losses

Prerequisites

• Riverchurn Monument on the battlefield
• Cut Your Losses in hand
• available

Steps

1. Cast Cut Your Losses 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 Cut Your Losses to mill the rest of their library

Results

• Infinite self-mill
• Infinite mill for up to two target players