Skeletal Dragon is actually way overtuned. It should cost one more mana, or not have taunt. Compare this card's value to cards available to other classes, and you see it's just not fair. The only reason it's not played that much right now because the meta is too aggro. If the meta were to slow down (it won't because T5 has their ass way up DH and Rogue's ass), the card would be completely bonkers.
For me personally, the game is shit right now. None of the decks I like to play are viable. My opinion is heavily biased, but that's just my opinion man.
You can wait until Hearthstone 3.0 and the meta will be still aggro, if the combat system is the same. 7 mana doing nothing on board is always too slow by mordern hearthstone standard.
And in slower control matchup, Priest already have many value engine generator so this card is only a nice too have, not essential