Hearthpwn

-Mulligan for 1 mana minions ,
if you don't have any 1 mana minions in the first hand you don't need to concede instantly , otherwise if your first hand has spells and minions with more than 4 mana , then it is a little bit difficult to try win.

-To avoid Living Bomb , you have to keep in your hand Wailing Soul , removals and Recombobulator
-Use [card]Void Terror[/card] to Living Bomb minions , but then make sure you have removal or Silence, if he try to Living Bomb your [card]Void Terror[/card]

-Play smart with your mana crystals , his hero power will deal 10 damage to you if you haven't spent all your mana on your turn.

-8 mana Chromaggus is the best call , think if you get 2x Wailing Soul ,2x Antique Healbot or removals, that will be awesome , make sure you have Silence or removals on your hand before play  Chromaggus...

- I always use Alexstrasza on me , but it's not bad choice to make him 15 hp , be careful on that , use your Alexstrasza on him if you have about 15 hp or more ...but again  make sure you have Silence or removals on your hand before play Alexstrasza for the Living Bomb card "killer" ...

-In some situations Kel'Thuzad may be a risky call , if he has enough Living Bomb , but Kel'Thuzad will give you a nice board control , i suggest you always keep at least Wailing Soul in your hand before play Kel'Thuzad...

-Remember , he has 5xLiving Bomb ,so adapt your calls , always thinking about that! 

Best of luck! 

Have questions ? leave comments 
 Thanks ! :)