Are you using the mobile app or the website when viewing the other players grimoire? If you're using the app, are you on android or iOS?
I've checked a few of my friends that haven't played TTK, and I see Kagoor card in their decks.
English
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Oh I'm sorry I was in exalted hive. I completely forgot he was a taken wizard so he was under taken instead of hive. My mistake!
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I'm on the app on iOS. How could they have that card from court of orix if they haven't played taken king? That is weird.