A USE FOR COMMON & UNCOMMON WILDCARDS (EXCHANGE FOR RARE OR MYTHIC)
Since the very beginning of the game, I accumulate common and uncommon wildcards. I have almost no use for them. Why not allow to exchange these wildcards for rare and mythic wildcards. For example:
200 common cards = 1 rare
100 uncommon = 1 rare
400 common = 1 mythic
200 uncommon = 1 mythic
I hope you will consider this idea.