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Use it for arena, and see how you do there. If you win at least 5 games, you will come out ahead. Otherwise you'll come out about even, or slightly below even since you get a pack every time anyway.
For me, I can't stand arena so I just buy packs. I actually got a few legendaries lately, which is amazing considering how many I have opened without getting any. I got a Tinkmaster, Greenskin, and a golden Jaraxxus which I disenchanted to make a Ragnaros.
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