Hearthpwn

This deck contains a large amount of fat minions and early game removal, intended to optimize the possible results from Y'shaarj. It's a bit difficult to play, as you need to be very aware of your opponent's removal. For example, against warrior you should never play Y'shaarj on a bulky board, as he will likely use brawl.

Against aggro, mulligan hard for a board clear and a healing wave. Earth shock and feral spirit will also be helpful. The deck does surprisingly well in this matchup, but is somewhat weak to divine shield. Once you start throwing down huge taunts it's usually game over for them.

Against control, aim to outlast them by forcing them to waste removal on your massive minions. If they don't do so, you can get a lot of value from Master of Evolution trades. As mentioned be very wary about playing Y'shaarj if they have not used any removal. If he gets mind controlled or entombed, the results can be disastrous.

This deck is also very strong against c'thun decks, since the minions have so much health to absorb his damage. Try to keep a hex around for when he inevitably plops on the board, and he'll be out of your hair for the rest of the game.

I currently have a 67% win rate at rank 7, and am steadily climbing with this deck.