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Its highly likely the company wont ever release any new Pokmon Master Ball Mirrors in the future, hence why it goes for more than most of the URs, SARs, and SRs in the setlist, starting at ~US$223 on the SNKRDUNK App

In addition, Khorne's berserk battle-fury and Slaanesh's hedonism fit well into red

In addition, the bottom of the card will have a textbox reading " TEST CARD - Not for constructed play ." The art is also often of lower, sillier quality as it is done in-house by R&D members rather than commissioned artists (hence the lack of artist credit on the cards)

You can find this Pokmon in the XY BreakThrough set