Hearthpwn

Proof: 

Hi there,

I created this deck to complete some Shaman and Murloc quests when I noticed that it is pretty strong. I went with a win streak from 13 directly to 10 within an hour. Currently on rank 7.

In general you try to finish the quest as fast as possible. Don't mind to run out of murlocs as your hand gets refilled by Megafin. 

For mulligan keep Murloc Tidecaller, Murloc Tidehunter, Grimscale Oracle, Primalfin Totem, Sir Finley Mrrgglton.

Against Pirate warrior or Quest rouge you can shuffle the quest and focus in board creating minions.

If you have coin you can keep Call in the Finishers and Primalfin Lookout.

Gameplan:

Try to play merlons on curve the first 4 turns and keeping board as good as possible. Lightning Storm and Maelstrom Portal are helping. Call in the Finishers on turn 4 or 3 with coin is the dream. When you finished the quest at around turn 5 - 7 your make sure to play at least one card after you played Megafin to avoid overdrawing. Once you have a solid board use Bloodlust, Everyfin is Awesome, Gentle Megasaur or Murloc Warleader to finish your opponent, there are so many ways...

Sometimes Megafin is not even necessary for winning as you creat a huge board with the low cost Murlocs and Call in the Finishers on turn 4 or 3 with coin into Murloc Warleader is damn strong. Everyfin is Awesome becomes super cheap or even for free, Gentle Megasaur and Murloc Warleader are helping to stick your minions on the board. So lethal at turn 6 is not that rare.

Further tipps:

Try to always discover a Murloc out of Primalfin Lookout. 

When you play Sir Finley Mrrgglton aim for draw, steady shot or sometimes healing could be useful to keep board.

If you don't have Finja, the Flying Star you can cut her for a Siltfin Spiritwalker, Coldlight Seer or any useful Murloc. As I don't have Old Murk-Eye you can change him in aswell. 

Feel free to comment, share suggestions or adding me (EU).