New arena:
http://arenamastery.com/EeN5
Draft looks reasonable to me, I think the only different picks I'd do would be
16: Mana Wyrm > Cone of Cold. I might be undervaluing Cone of Cold, ever since it got nerfed from 3 mana to 4 I can't play it without remembering how it used to be.
17: Mad Bomber > Worgen Infiltrator. You can make an argument for either, but I like how T2 Mad Bomber, kill their 3/2 or 2/1 can swing the board in your way. If that doesn't happen, well it's turn 2, they'll trade it anyways and you don't lose much. You'd also have the 2 Mana Wyrms if you did the pick on 16, so you'd probably be okay for 1 drops.
22: Raptor > Cult Master just for the 2 drop, and because you already have a Cult Master. Cult Master is very nice when you drop it and immediately trade, so you want those 2 drops and 3 drops all the more.
29: River Croc > Worgen just for the 2 drop, but this can be argued either way.