Hearthpwn

So I built this deck with the sole purpose of getting a 10-attach Redeemed Pariah to get the 200 XP from the achievement. Well it turns out the deck is actually very good! Playing in legend (around 4.5k) I went 4-1 until I managed to get it to 10/13, and the only reason I didn't manage it earlier is because a couple of opponents gave up too fast. It is a 2-drop with premium stats that can be easily played on curve and together with Line Hopper, which is a premium-statted 3-drop that can also be played on curve, they can do some silly stuff. Many opponents won't be able to remove those minions when played on curve and you can do stuff like Coin into Skull of Gul'dan on t4, followed by a couple of 0-mana outcast cards to buff your Pariah to Edwin-like proportions.

Give it a try!