Riverchurn Monument

one generic mana one blue mana Artifact

one generic mana , tap this permanent : Any number of target players each mill two cards. (Each of them puts the top two cards of their library into their graveyard.)

Exhaust — two generic mana one blue mana , tap this permanent : Any number of target players each mill cards equal to the number of cards in their graveyard. (Activate each exhaust ability only once.)

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Riverchurn Monument rulings

2025-02-07
Exhaust abilities can be activated any time you could normally activate an ability.
2025-02-07
If an exhaust ability of a permanent is activated, and then that permanent leaves the battlefield and returns to the battlefield, it becomes a new object so its exhaust ability can be activated again.
2025-02-07
If an ability triggers whenever you activate an exhaust ability, that ability resolves before the exhaust ability resolves.

Riverchurn Monument keyword rules

Exhaust Rule 702.177

An exhaust ability is a special kind of activated ability. “Exhaust — [Cost]: [Effect]” means “[Cost]: [Effect]. Activate only once.”

An effect may allow you to take an action as long as you haven’t activated an exhaust ability this turn. Such an effect allows that action only if you haven’t begun to activate an exhaust ability this turn.

Mill Rule 701.13

For a player to mill a number of cards, that player puts that many cards from the top of their library into their graveyard.

A player can’t mill a number of cards greater than the number of cards in their library. If given the choice to do so, they can’t choose to take that action. If instructed to do so, they mill as many as possible. Similarly, the player can’t pay a cost that includes milling a number of cards greater than the number of cards in their library.

An effect that refers to a milled card can find that card in the zone it moved to from the library, as long as that zone is a public zone.

If an ability checks information about a single milled card but more than one card was milled, that ability refers to each of the milled cards. If that ability asks for any information about the milled card, such as a characteristic or mana value, it gets multiple answers. If these answers are used to determine the value of a variable, the sum of the answers is used. If that ability performs any actions on “the” card, it performs that action on each milled card. If that ability performs any actions on “a” card, the controller of the ability chooses which card is affected.