For those of you that are worried about not having much of a collection yet and how that will affect your playing, I wanted to show off some budget decks to show you that you can still be competitive without having many cards yet.
I'll try and do a new one every week or so for a little while in an effort to get people on the fence to jump on over.
Today's deck is a Fire/Time deck that I took from the start of the ladder (Bronze 3) up to Silver 1 pretty quickly. It contains 11 rares, 4 uncommons, and 35 commons which ends up being 10,950 shiftstone (dust). You get 100 shiftstone for opening a pack and can disenchant cards for it as well. You should be close to completing it after completing all the tutorials/gauntlet/forge that give you free rewards.
With a lot of the decks at the lower levels revolving around building a giant minion with weapons or playing a lot of removal, the deck allows you to either just go wide around the one giant minion or cause opponents to be spending multiple mana to kill your 1 mana creatures after they already made a minor impact on the game. Many games involve hitting for early damage, teleporting their blocker, and then finishing them off with multiple charge minions or a team wide buff to attacks.
The deck is also very fast, which should enable you to rack up rewards quickly so you can start making decks that are more expensive.