Name: Horizon Stone Cost: 5 CMC: 5 Color: CID: Type: Artifact Rules Text: If you would lose unspent mana, that mana becomes colorless instead. Set/Rarity: Magic Online Promos rare, Commander Legends rare Legality: Legal in duel, Legal in vintage, Legal in commander, Legal in oathbreaker, Legal in legacy Price: $1.74 Foil price: $1.98