Recently, Blizzard announced that Alexstrasza, one of the Dragon Aspects from World of Warcraft, would be joining the Heroes of the Storm Nexus soon. Yesterday, Blizzard released a look at all of the skins that she'll have available at launch, as well as upcoming skins for a few other characters.
Alexstrasza has low damage, but high utility with healing and damage spells with the awesome ability to shapeshift into a dragon as well.