DISCLAIMER: My deck did not include Shadowform. I had Shadow Word: Pain but certain cards still seem to be bugged in the deck builder.

This is basically a gamble deck. It succeeds or fails on whether you get it's two most important treasures: Dragon Affinity (Dragons cost 2 less), and/or Discs of Legend (summon a copy of Legendaries played from hand). I would have picked up Dragonblood (minions get +1/+1 when a dragon dies). But it wasn't offered. 

As with any deck or run, if you get a lead on the board, be cautious of over playing what you have. Lots of crazy board clears in Duels. Having early answers is also crucial at this time so that bomb warrior and murloc shaman don't snowball you (my last two opponents). 

I don't remember every other treasure I picked up but a few were: Hagatha's Embrace (give a minion in hand +1/+1 each turn), Two Sow the Seeds (give minions in your deck 1+/1+), a Golden Kobold (6/6 turn your hand into Legendaries) which I never used but grabbed after getting Discs of Legend, Vampire Fangs, and Bubba but never had a chance to use him either. Oh, also a Royal Giftcard (+2/+2 for each minion you control) that got me a comeback win at least once.

Another important tip is that I picked "No  More, Please" most of the time when offered unless there were good Legendaries or a Dragon bucket.