Name:Keening Stone
ManaCost:6
Types:Artifact
A:AB$ Mill | Cost$ 5 T | ValidTgts$ Player | TgtPrompt$ Select target player | NumCards$ X | SpellDescription$ Target player mills X cards, where X is the number of cards in that player's graveyard.
SVar:X:TargetedPlayer$CardsInGraveyard
Oracle:{5}, {T}: Target player mills X cards, where X is the number of cards in that player's graveyard.
