Hearthpwn

I feel people are underrating this card, although it has an ENORMOUS value in arena depending on your deck, it will be always a constant 5/4 menace that will grow proggresively.

How can we use it?

Hunter and Warlock are the most simpliest examples, as like, Hunter has access to Unleash the Hounds and Warlock can develop an enormous arsenal of small minions, combined with a few taunts, a powerfull and effective one should be Felguard or Hired Gun for control, we can even change its stats and make it grow even farther with a bigger menace with Crazed Alchemist orKooky Chemist, so this thing can grow a LOT, may be too slow and vulnerable, however, in the effective deck (Like Y´Shaarj on Barnes decks) can be demolishing, I think can see play, not as much as other values, however in general is a nice card to keep the control and also beign aggro, also, an easy combo and protector with token Druid, I think it will become a bigger thing in the future with this and the new cards.

Weakness:

The most easiest ones are Shadow Word: Death and Flamestrike, for the ones that are most played, however, also a Taunt deck will be weak against, since the tokens are gonna be that weak, this thing will bump into a wall of infinite taunts and will dies soon. Try to buff its health as priest, or put a wall of taunts with warrior, in wild, this is completely brutal in mage with Wee Spellstopper, unless AoE are involved, pretty effective with stat changes, like I said above.

Overall score for me: 7/10 in contructed and 7.5 in Arena. This card can  have an incredible value and can go extremeadly wrong with it.