Rastakhan's Dragon Priest Quest / The Undeathwing

In general, just keep in your mind your opponent may play aggro, the easiests decks to climb the ladder. keep your duskbreacker and wyrmrest agant to keep the early game and try to generate more duskbreacker. If your opponent is a little more slow, just generate crazy stuff with historian and firetree withdoctor. 

Control the early, and every time your oppoenent create a threatening board, clean it with excavated evil or duskbreacker and duplicate it.