Name: Knowledge Pool Cost: 6 CMC: 6 Color: CID: Type: Artifact Rules Text: Imprint -- When this artifact enters, each player exiles the top three cards of their library. Whenever a player casts a spell from their hand, that player exiles it. If the player does, they may cast a spell from among other cards exiled with this artifact without paying its mana cost. Set/Rarity: Mirrodin Besieged rare, The List rare Set Code: MBS-R, PLST-R Legality: Legal in vintage, Legal in penny, Legal in commander, Legal in legacy, Legal in predh, Legal in duel, Legal in oathbreaker, Legal in modern Price: $1.07 Foil price: $3.01