Guys, I just started playiing this about a month ago and only do quests during weekends. I've been spending my gold on standard packs and bought the welcome bundle. I've also preordered the new bundle.
Should I keep buying standard packs?
How hard is it to get to rank 20? (my goal is to have a complete collection of cards, and just get to 20 for the card back)
Is there a standard deck I should aspire to first to then modify? (I feel most comfortable with shaman, warlock and priest).
Thanks.
They've been pushing hard to make the game revolve around newer sets rather than classic set, so newer cards are going to be what you want in general. Still you need to have bulk of the classic common/rare cards and some epic and class legendary cards in particular. More stronger legendary cards like Sylvanas and Ragnaros are being phased out next month and can't be opened from classic packs. In case you have arcane dust and don't have them, you can craft them for effectively free right now as you get your dust back next month. I wouldn't buy classic packs, you get one each week if you play tavern brawl for free and their value has diminished quite a lot. It was a different story like a year ago. Newer decks are going to have many more cards from new sets, it varies with different classes but that's their goal and they will be getting there eventually. In newer sets, they've been pushing decks that more or less are built by last 2 sets with higher power level cards. Welcome Bundle is great value and you bought it already, I think you should stop there with classic packs and slowly get the cards from tavern brawls or craft the more rare ones you don't have and save your gold/money for new sets.
With that said the goal of collecting all cards is just impossible, I'm telling you right here. Collecting every classic card or maybe card in new sets is more reasonable. You can't buy old sets anymore, you can never get those cards. Good news is that no one needs to have every card. Your preorder will net you every common and rare card in the set along with handful of epics and 2-3 legendary. What will remain for constructed play are maybe 3-5 legendary and about same number of epics which you're better off crafting.
Might want to do your quests 2 times a week, since you lose 4 quests each week right now, you can login every day too and swap any quest you can't see your self doing, some quests are a lot better than the others for gold/time.
If you do your quests, you will get to rank 20, you can't lose stars so you can only go up and get there after winning like 15 games at most? yeah. It's nothing. With win streaks it can take half of that.
Shaman decks or zoo warlock are cheap, you can sub the cards you don't have with something else and get rank 20 easily. It's not a problem.
You should save your resources right now and wait for next standard year which start in April. That's a much better time to spend things on when we know what's relevant. You don't want to spend anything on TGT/LoE/BRM right now, all of those go out of standard in 3 weeks.