Name: Keening Stone Cost: 6 CMC: 6 Color: CID: Type: Artifact Rules Text: {5}, {T}: Target player mills X cards, where X is the number of cards in that player's graveyard. Set/Rarity: Rise of the Eldrazi rare, Commander 2016 rare, The Brothers' War Retro Artifacts rare Legality: Legal in legacy, Legal in duel, Legal in penny, Legal in vintage, Legal in commander, Legal in timeless, Legal in gladiator, Legal in modern, Legal in oathbreaker, Legal in predh, Legal in brawl, Legal in historic Price: $0.28 Foil price: $0.32