Apparently ranking up a class gives more than just cosmetic bonuses (namely, skill points). Other than pulling the same card again from supply packs, are there any other ways to rank up a class?
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AFAIK packs are the only way to level up a multiplayer class. Kind of a frustrating ceiling to hit. – Dpeif Mar 29 '17 at 16:13
No.
You can level the class by getting experience in matches, but ranking it up is done exclusively by getting cards in packs.