Decided to chime in since the developers seem to listen here (much props @Sirrian and team). This thread seems to have gone way off the rails and had 3 different subjects, the sneak peak at the start, then a discussion about crafting around the middle, and now a discussion about new ways to obtain good cards. While @Sirrian did mention adding a way to "target something that you need", which I totally agree with, the specific problem being brought up that he was responding to was end-game players who were not getting the specific cards they needed to "complete the set". This seems to have been lost/forgotten in the later discussion, they were not saying they were having difficulty getting legendaries/mythics, only that they were getting duplicates or unneeded versions rather than specific ones. While there have been lots of suggestions on here about addressing this (both good and bad), personally I'd like something fairly simple, like either some sort of "crafting machine" (trade X cards for a different card you need of the same rank) or a "targeted chest" (pay more keys/gems but chest will only give cards you need). To me both of this are very simple, and that mans they are hopefully easier (sooner) to implement, and also fairly easy to adjust/fine-tune (change from 2 cards to 5, or from 10x keys down to 4x, etc.).
As for all the new ways to get cards, like a 60 day login, I think they are a bad idea. The game already has lots of ways to get cards, and if they want to give them to us more frequently, they can simply change the drop % . We don't need some sort of complicated recipe that guarantees high level cards, we just need a way to make sure that when we get those high level cards that they are useful. As a disclaimer, I'm not an end-game player, and have pulled 0 mythics after about 4 months of play. The suggestion that I should basically have 2-4 guaranteed mythics already (based on either 30 or 60 days of logins) seems ridiculously too easy. If they ever did something like this I'd expect a number in the hundreds (only 1 or maybe 2 a year).