This!
Just imagine how long certain sets will take to complete when the next lot of cards are released. I really think we need more options to be able choose a specific card we want. Even if it costs us 5 cards instead of 3. At least people know that they'll get one of the common cards they needs easy enough.
I'll probably bring this up in the suggestions thread at some point, asking for a system that lets us choose a card. Events are to far between plus we have to win. That's way too difficult and not often enough.