Riverchurn Monument + Terisian Mindbreaker

Prerequisites

• Terisian Mindbreaker does not have summoning sickness.
• You have not activated Riverchurn Monument's exhaust ability.

Steps

1. 1Declare Terisian Mindbreaker as an attacker, triggering its ability, causing an opponent to mill half their library, rounded up.
2. 2Activate 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 attacked by Terisian Mindbreaker to mill the rest of their library.

Effects

• Infinite mill for target opponent