Good card in terms of stats. 9 mana for 16 worth of stats distributed defensively. I think it will see play in a late game value oriented dragon non-priest deck. Could also be good as a 2-of in a deck with dragon hatcher.
Pretty good common card, dragon synergy, arguably better Giant Mastodon against priest especially. Arena pogchamp, will see standard play from Netherspite Historian discovery, and it is probably one of the better discoveries in certain cases considering there aren't any other taunt dragons in standard right now. There's a good chance a deck like F2P dragon priest could play this, with Inner Fire its a turn 10 12/12 with taunt, and even if it gets silenced a 4/12 body is pretty good.
This card is SOOOO much better than anyone thinks. Dragon decks always have had problem staying alive in the lategame since few of the big dragons are defensive. Playing this at 9 or getting it of Dragon Hatcher or Deathwing, Dragonlord is fantastic. You can't compare this to Ysera/Malygos/Nozdormu/Onyxia since non of those really help you if you are playing from behind.