{@R} Riverchurn Monument [Aetherdrift Prerelease Promos][PR DFT 057]

1, T: Any number of target players each mill two cards. (Each of them puts the top two cards of their library into their graveyard.)

Exhaust — 2UU, T: Any number of target players each mill cards equal to the number of cards in their graveyard. (Activate each exhaust ability only once.)