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 Set Code: PRM-R, CMR-R Legality: Legal in legacy, Legal in oathbreaker, Legal in duel, Legal in vintage, Legal in commander Price: $1.27 Foil price: $1.65