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Like most Magic: The Gathering cards, the value of The Darkness Crystal depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Final Fantasy)
The most sought-after cards in Two Legends include Silvers Rayleigh OP08-118, Kaido & Linlin OP08-119, Tony Tony.Chopper OP08-007, Carrot OP08-023
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This means that it can be used as one of two Commanders in a deck, provided that the other also has a Partner keyword
(Artifacts, legendaries, and Sagas are historic.) P/T Number 673 Language English Legal Formats Commander, Historic, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Pauper, Pioneer, Standard, Timeless Rulings (6/16/2023) A card, spell, or permanent is historic if it has the legendary supertype, the artifact card type, or the Saga subtype