The only nerf I can see for it is stock gain removing, but not wall/tower gain or cost changes.
It's unreliable for building decks - yes, you can have some benefits from it when it's played early enough, but it's a keywordless rare, i.e. you can't really hope that Scepter of summoning or Scepter of evolution will draw this one, not a recruits-only Dragon oneshot.
Speaking about Dragon oneshots - this card can be killed by Dragon squadron, Bahamut, Water elemental, Leviathan, All-elemental attack, Apocaltyptic rain et cetera.
Don't turn it into another Laputa, please - that one was overnerfed as hell, even Dwarven fortress is better now.