Ima preface this by saying I am neither an Innkeeper dev nor familiar with all the languages that Innkeeper uses, so this could be totally wrong.
I do not think this has been brought up, but I can see why this would be requested, judging by the positive feedback on the news that golden card selection could be removed from arena.
From my knowledge with programming, this would just be a boolean that you toggle on & off. Depending on what the value is would trigger a conditional that tells the deck maker which to prefer when the option comes along. So I don't see difficulty in this becoming a future feature.
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Wants to play Captain Cookie Druid because why not?