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Magic 2010 was also the first core set with planeswalkers and mythic rares. Some new cards were answers to strong cards in the metagame. Because of this, Magic 2010 was the first core set since Beta to feature new cards, some of which had a top-down design.
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The core set was getting a significant face-lift in an attempt to return it to some of its original resonant flavorful glory. There would be only one rotation date per year when the large Fall set was released. To accommodate this much more rapid core set turnover, the format rotation policy was changed. Doing a core set every year precluded Wizards of the Coast from doing other fourth sets, like Eventide, Coldsnap and Unhinged, but would provide a much more structured and predictable release schedule of three expert-level expansions and one core set each year. Instead of listing the number of the edition, the set is instead named after the year after the product was released. With Magic 2010 the naming convention for Core Sets was changed.
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