Riverchurn Monument + Traumatize

Riverchurn Monument

Traumatize

How it works

1. Cast Traumatize by paying 3, causing a player to mill half their library, rounded down.
2. Activate Riverchurn Monument's exhaust ability by paying 2 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.