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However, he flagged that his team had managed to sneak even more deep-cut characters such as the villain Volcana into the set as commons by featuring them in the art and flavor text of otherwise generically named cards
Turning a Morph face-up does not make the target illegal immediately
Things like Selenia, Dark Angel hold no real value in the game anymore
ARC-V episode 27: "Challengers Assemble" Yu-Gi-Oh
That being said, it is certainly possible that Masterpiece Cavern of Souls, for instance, might overshadow the Modern Masters 2017 foils for a while, though any gap that opens in their relative prices will only set them up to service different segments of the market or set the stage for the gap to close over time