Basics: Gain midrange tempo and control the board as a typical dragon deck. There are plenty of ways to maintain board control and keep your minions alive at the same time. Towards the mid-end game, Shadowform to cement your board control and allow your bigger minions to go face.
1 Power Word: Glory: You just need a method to get back a ton of health in the mid-late game, and it's this. Just play it when you have the board under your control and you can start gaining health back. Don't feel the need to wait for a Dragonkin Sorcerer, where you play it doesn't matter nearly as much as when you play it. If you're really in trouble against aggro, remember that you can even play it on an enemy minion.
2 Wyrmrest Agent: He's just good! He's great on curve and an amazing anti-aggro tool. Not only is he good early, but taunts are good throughout the game.
2 Shadowform: Use in the mid-late game during a tempo swing (preferably on one of those turns where priests normally pass). However, it's sometimes good to get it out as soon as possible, if you're lucky enough. Great card. You just start dominating the board completely.
2 Dark Cultist:
2 Dark Cultist: Amazing card.
1 Mass Dispel:
1 Mass Dispel: It's the only silence in the deck. Save it for Tirion Fordring or Sylvanas Windrunner, or any other really important time. The card can be incredibly important in the right circumstance.
2 Dragonkin Sorcerer: It's really good midgame. You have Power Word: Shield and Power Word: Glory. I also like to keep this at mulligan becauase it's a decently early dragon that powers up your Twilight Whelp and Wyrmrest Agent.
2 Blackwing Corruptor: He's really good. Tempo mid-range plays.
1 Azure Drake:
2 Holy Nova:
1 Holy Fire:
1 Holy Fire: The card is pretty much a Fireball and an Antique Healbot in one. Lots of things have 5 health, and you need some way to heal once Shadowformed. Good against any deck, but surprisingly good at sealing the deal with aggro decks.
1 Lightbomb: The deck could use an emergency play, and this is it. Dr. Boom is a thing, and Grim Patron is a thing. Also, I've noticed that this deck has some trouble with Ragnaros the Firelord, so keep this card if you suspect your opponent has him.
1 Drakonid Crusher: Surprisingly good here. He's yet another dragon that waits until the late game to power up your dragon cards, but you can play him turn 6. Your opponent will expend resources to kill your other large dragons or buffed up minions, it would be hard to deal with yet another enormous minion in the late game with you have 4 extra mana for accessory plays.
1 Chillmaw: Damn, this card is good. Yeah, anti-aggro, but against everything else too. Not many decks run big taunts nowadays, and this guy just handles shit super well.
1 Prophet Velen: Huh? What? YUP! It's really just the Shadowform synergy. It's completely gnarly. Mind Spike goes up to 4, and Mind Shatter goes up to 6!!! DAMN SON! And if he manages to stay alive (honestly he does sometimes), see if you can Holy Fire to win the game. HOWEVER, if you're facing aggro and you need to heal some more he works in that situation as well.