Card name

Keening Stone

Mana cost

{6}

Mana value

6

Type

Artifact

Rarity

rare

Set

The Brothers' War Retro Artifacts (BRR)

Collector number

26

Artist

Jung Park

Official rulings

2010-06-15 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.