Keening Stone
Artifact
, 
: Target player mills X cards, where X is the number of cards in that player's graveyard.
As it spins, dead voices shriek in an ever-increasing cacophony, rending the mind asunder.
イラスト：
Rise of the Eldrazi#219レア英語適正
裁定
2010年6月15日
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.