This is not your typical Dragon Priest deck, as it also includes the (in)famous Divine Spirit + Inner Fire combo. The new card -- Bonemare -- can help with making the combo even stronger by giving another friendly minion +4/+4.
So, in case your dragons can’t win you the game, you can use the combo to finish your opponents. However, this deck includes some of the strongest and most effective dragon creatures from the last few expansions, so you should have no trouble winning with it.
Also, consider that Bone Drake can give you a legendary dragon, which will increase your chances even more.