Name: The Core CMC: 3 Color: CID: Type: Legendary Land Rules Text: (Transforms from Matzalantli.) Fathomless descent -- {T}: Add X mana of any one color, where X is the number of permanent cards in your graveyard. [Back face. Transforms from Matzalantli, the Great Door.] Set/Rarity: The Lost Caverns of Ixalan rare Legality: Legal in modern, Legal in future, Legal in oathbreaker, Legal in commander, Legal in brawl, Legal in standard, Legal in standardbrawl, Legal in duel, Legal in historic, Legal in pioneer, Legal in timeless, Legal in gladiator, Legal in vintage, Legal in legacy, Legal in penny Price: $2.53 Foil price: $2.21