Early minions trick the priest into using their duskbreaker so that spellstone have a higher chance of making a impact. Also try to fin rexxar so you have large minions the priest needs to deal with. But be carefull of mind control.
Against pally having defensive secrets and candleshot really helps alot, its also why i dont have unleash because candleshot and secrets usally is enough. And if it isnt chain gang helps keeping them at bay until rexxar or spellstone takes over the board.
Against warlock idk, try to do max amount of damage. And hero power ALOT
Secrets mage you can control the early board and destroy them with spellstone. Big mage is tricky but Rexxar is important if they can hold of your spellstone and early minions. Lifedrinker can give you extra reach for lethal and survival, so be careful discarding them when tracking.
Warrior is very much the same as as big mage but try not to go "to" wide, brawl is always there. And keep their armor low. Rexxar can win you the game against warrior, rexxar can be hard to deal with for warrior.
Against shaman, rogue and hunter its important to get a good start. If not you will have a hard time catching up. And go face! trading to much can cost you the game.
Against druid its very important to know what kind of druid your facing because of plague. Spiteful you try to control the pace of the game and maybe even outvalue them with rexxar. Taunt druid: SMORC fast.
The major difference from v2 is that shaw is gone, i found him to be less useful than having the ability to find lifedrinkers and silence from stitched trackers to finish the game. Stitched tracker does fit well in the deck since there is alot of spells. Also having more chain gangs against paladin dosent hurt.