I've got two R Babes (Airu and Yuri) maxed out, with the remaining slots filled up by lv50 SR Moes (Hiyori, Kasumi, and Rie). Been doing reasonably well so far.

Is there a way of figuring out what Rank my deck will show up as?

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Ooh, there's a guaranteed SR Limited card if you can score 50 consecutive wins. I think I'll try farming easy fights for that first before going after higher-ranked people for event gacha tickets.