Hearthpwn

Rogue or hunter ? Any other ?

Mech Hunter cause Rogue got nerfed. 

Murloc Shaman

Murloc Shaman.

Then it's zoo, 

Only after those two rogue and hunter ("secret") come into play.

Rogue isn't as agressive as it looks, it's by definition a tempo deck. It usualy skips turn 1 (or a southsea that doesn't accomplish much) and dagger up turn 2 (if not on coin) But then it has disgusting turns right after such as prep raiding party backstab vancleef into toggwaggle pick double taunt - not even talking about lackey madness - tha tcompensate for the early slow start. (it's still an agressive deck, but it's not as agressive as murloc shaman or zoo).

Murlocs. 

I think Mech Hunter will all bombs feels very aggressive and hardest to counter, at least when I play Bomb Warrior.