Thanks to some feedback i reiterated a little bit on this. Biggest strength from dragons comes in the mid game with average early game. Ultraxion comes online as a very high win condition once properly buffed in the very late game.
Some other notes
Golden Nether Drake does nothing extra
Golden Frostbrood freezes 4 minions
Golden Scaled nightmare triples attack instead of double
Golden Emeriss Triples Attack and Health instead of double
Golden Ultraxion does its damage twice
Chromie is counted as a non dragon while in her gnome form (art)
The 2 primary styles are either summoner ultizing Storm Egg + Emberscale Wrymkin, or Chromatic deathrattle bouncing. This bounce pairs very well with Frostbrood Vanquisher and Baron Rivendare.