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Also, I reeeeeeeeally wish I had Sylvanas. She'd work perfectly in this deck.
I would either get 7 classic packs (there's a lot of useful commons that you should try to collect), or the second wing of Naxxramas, which provides you with Sludge Belcher and Loatheb.Getting a good collection of basic cards first might help, because some of the NPC bosses can be tricky without them.
So, I made a silly zoo deck for my 5 warlock wins quest:
I think Grim Patron Warriors are the best thing to ever happen to Hearthstone. They're a top-tier deck that require an immense amount of skill to use effectively. Hearthstone doesn't have nearly enough deck archetypes like that. Plus, it's relatively cheap in relation to other decks (not counting Adventures; but at this point, if you don't have Naxx and Blackrock, you're not going to be able to build any kind of competitive deck), so F2P (or other "cheap") players can use it, as opposed to other skill-based decks like Control Warrior that have an extremely high price of admission.