Been playing for 2+ years now, saved all my wildcards and trying to max out a set.
The result is that RARE (gold) wild cards are about 150 lower than every other type (including mythic).
Basically there is going to be no way to accomplish this task unless the amount of rare gold cards is increased for awards.

In the instance of Final Fantasy set, the quick drafts and such don't show up enough to even play/draft the remaining cards...

Players should have a way to "cash out" certain cards of 1 level to buy the same level in a different set IF the awarded ratio of gold rares is going to be so much lower.