Hearthpwn

This strategy makes most of the heroes easy but if you get Magistrix she can be hard to beat.

Since you only have 25 seconds to take your turns against her it makes it difficult to cast sound the bells enough times, and she also fills the board with mage secrets frequently so emptying your hand against her is dangerous (ie, if your spells get countered you're screwed)

I've lost to her 3 times with decks that otherwise seemed unbeatable, very annoying.

Im a noob with few cards and its not that easy for me

I beat monster hunt and kobolds dungeon run with all chars and I do ok in arena but anything requiring building my own deck is tough since i only have a few epic/legendary cards right now.. guess I need to buy more packs

The +2 health to minions treasure really helps to keep your hounds on the board, then focus on buckets with buffs to add damage.

If you can get the +2 hounds attack treasure for 3/3 hounds that is ideal, but the time I beat it I was just using the +2 health and crystal gem.

the 3/3 hounds are great against Azalina since when she uses her treasure to take over your minions they lose their buffs and then her board is filled with 1/1 stuff that you can just ignore.

I only recently started playing hearthstone so it took me quite a few tries with most of the heroes (especially tracker).  It got a lot easier though once I got a good feel for how the AI works and got better at predicting how it will prioritize attacking minions that don't have taunt. 

Tracker: 170 (got screwed by face collector, gnomenapper and the final boss so many times, my number is slightly inflated though because  I quit after the first boss probably 20 or so times when I didn't get one of the good treasures (Cult of the Wolf, sticky fingers or Crystal gem). 

Houndmaster: 53

Cannoneer: 57

Toki: 8 (completed two runs with her in 20 games, super easy if you get the double spell treasure with spell dmg buffs)