Versus aggro decks, the plan of the deck is to remove their board many times until the deck stabilizes. Thanks to the new dragon Crazed Netherwing there are enough good boardclearers to do so; Nether Breath helps clearing an early threat and gives you some nice heals that can help you getting out of reach. Dark Skies clears small boards early game and Scaleworm removes a minion while putting a body on the board. Lord Godfrey, Hellfire and Zilliax don't need any introduction.

Versus slower decks, like control or combo, this deck is the aggressor, the plan is to play threat after threat until the opponent runs out of answers. Mountain Giant to start, then Abyssal Summoner and following Siamat or Evasive Drakonid should be a nightmare for your opponent one after another. An early Expired Merchant should help adding another copy of one of the previous cards in hand, helping the continous pressure. 

The deck has to runs some dragon because Nether Breath and Crazed Netherwing seem very strong. So i decided to run 2 of [Hearthstone Card (Twilight Drakes) Not Found] that was already a card i'd put in the deck anyway; Cobalt Spellkin is there because it gives the dragon in hand requirement and because it gives you cards in hand that will make [Hearthstone Card (Abyssimal Summoner) Not Found] stronger while putting a body on the board, 1 mana cost spells in warlock are generally good too; Evasive Drakonid gives the dragon in hand requirement and is a good follow up to [Hearthstone Card (Abyssimal Summoner) Not Found], control decks will have an hard time dealing with it; Brightwing is there for the dragon in hand requirement and because is a turn 3 play that replaces itself in hand so that is still possible to play Mountain Giant on turn 4 if you start second.

In total there are 7 dragons in deck, which i think is a complete reasonable amount. So i added cards that are good when you have a dragon in hand: Firetree Witchdoctor is a nice 2 mana card that replaces itself and Scaleworm can give both value and tempo.

Depending on how the meta will be, there are a lot of cards you can tech: Demonic Project if you have to deal with a combo deck, Barista Lynchen and Omega Agent if there will be a control deck that just try to remove anyting, Barista alone can be played if some more value is what you want as the deck runs a lot of battlecry minions; the new anti-dragon card if the meta will be full of dragons, there are a lot of possibilites, but is impossibe to say for now.