Hearthpwn

Based off StrifeCro's Grinder mage, I used to love his deck. Duplicate what you need and win by dumping Rag three times in a row ;)

https://www.youtube.com/watch?v=yrITIW_6y6A

For X matchup I duplicate : 

Freeze mage : Loatheb / Healbot

Warrior : Anything big. Yes you will make warrior run out of removal, but it's a long game. Use your duplicates wisely.

Aggro : Sludge / Healbot. just stay alive hehe

The other matchups will depend

I chose : 

Archmage instead of Boom : Boom screws up your duplicates while Archmage wins on it's own (simply op)

Nefarian instead of Ysera : Ysera is just too slow (sucks I know)... And having Ysera on board for too long will make you burn cards. Nefarian is just a more controlled version of Ysera

IMO the idea of the deck is to give you enough time/heal to setup your duplicates for big/useful minions. This is why there is so much heal in the deck. Of course, cleaning out a zoo's board is auto-win too.

There is no real bad matchup for this deck as long as you have enough time to do your stuff. Warrior and Zoo can be a pain

Have fun!