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Yet to find one for specifically Arena, but if you haven’t found the normal MTG community put this into the search function. !mtg@lemmy.ml and also for specifically you (a lemmy world user) https://lemmy.world/c/mtg@lemmy.ml here is a link if you wanna be lazy lol. Maybe they or their discord (linked in their sidebar) would know if an Arena one exists already or not. GL