Riverchurn Monument + Fleet Swallower

Prerequisites

• Fleet Swallower does not have summoning sickness.
• You have not activated Riverchurn Monument's exhaust ability.

Steps

1. 1Declare Fleet Swallower as an attacker, triggering its ability, causing a player 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 targeted by Fleet Swallower's ability to mill the remainder of their library.

Effects

• Infinite mill for target opponent