Keening Stone
From Rise of the Eldrazi set
Keening Stone
Artifact
, : Target player mills X cards, where X is the number of cards in that player's graveyard.
Rulings
- The value of X is determined as the ability starts to resolve. If the targeted player has five cards in their graveyard at that time, for example, this ability will put five more cards into that graveyard from the top of that player's library.
