The total RNG of MM can make it insanely difficult to finish a card. We aren't getting lighthouse benefits. We can't farm adepts on the card. Just make it 7 total wins and call it a day.
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I think the card is fine where it is, although I would not be opposed to having it drop to 6 or even 5 win boxes. That would still keep it from being too easy while also making it more appealing to the players who win often for farming rolls.