This is a vocaloid software represented as an idol character
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The official french MTG account on Twitter has changed its Avatar and Background image to include Miku
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A few players suspect that this is a teaser for a possible Secret Lair or alternative product featuring Hatsune Miku
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Wizards said that will reveal more about this tomorrow!
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@purplesnap, a Level 2 Judge from the podcast Scourge Divas, was one of the first people to notice Miku on MTG's french account
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Hatsune Miku has already appeared in MTG sleeves and playmats in the past (made by UltraPro and other companies), but never in official artworks by Wizards of the Coast
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With IPs like Fortnite being added to Magic's Secret Lair, it wouldn't be totally surprising to see Miku in a card as well!