I am missing my 0 mana cards, as all of them are lvl 1, I cannot play them in Diamond, and it's unlikely I'll spend the $ to upgrade them any time soon.

I just started playing today and so far my deck is holding up OK, it remains to be seen how I do as I progress. There may be a few holes that I selectively fill to bring some cards up to the minimum level within my budget. That's going to be tough, because I really (REALLY) want these new voucher cards and I'll also need them at a higher level than I would have otherwise bought them if I was only looking at the abilities by lvl, now I have to consider the min lvl for my league, or well, they are unplayable and rather pointless outside of tourneys