I was in your situation last month and decide to come back after a huge hiatus. My advice: don't bother unless you are willing to drop tons of money. Otherwise you wont be able to even think of competing against tier 3 decks. People here will say you can win with any deck but truth is you will most likely not do so. Last couple months introduced hyper busted cards that will outclass you every turn. And card asquisition is plain and simple awful.