When mommy and daddy is better than a world-ending Lovecraftian abomination.

In all honesty, Raid Boss Onyxia can win you the game by herself if you cheat her out early. And whoever made Kazakusan should be given a Nobel prize. What a ridiculously fun card. And to top it all off, playing dragons allows you to play one of the most broken cards in Hearthstone history, Breath of Dreams.