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[36] In January 2019, when MTG Arena was still only in open beta, it became clear that the extent of play exceeded WotC's wildest expectations

WotC internally calls it the Thalia problem, so with this example, you might have two of the Dark Ascension art, one of the Innistrad: Crimson Vow , and if you wanted the Multiverse Legends one, you'd only need to craft one new rare wildcard to allow four of that style to grace your decks

Whats not to like

Also, there are always ways to build decks in colours that dont make sense, there are a few Blue Aggro decks, but it isnt a common thing, and you shouldnt be trying to break the mould with your first deck