Hearthpwn

it triggers on attack so when you swing it it'll be a 6/3>6/2 then 8/2>8/1 etc.

The Keepers of the Staff are the 10/10 minions from the Heroic Rafaam fight:

Archaedas, Chieftain Scarvash, Giantfin,Lady Naz'jar, Lord Slitherspear, Skelesaurus Hex, Sun Raider Phaerix, The Steel Sentinel, and Zinaar. 

Straight forward and useful. While destroying your opponent's Hero Power may not be very significant against Tempo/Midrange/Aggro decks, especially since it set your Tempo back by 5 Mana, it's very useful against Control decks. Destroying a Control Warrior/Priest's Hero Power is devastating for their survival, and if you're lucky to hold this when your opponent use Jaraxxus...

Lore-wise, Gul'dan used the Cipher to sever the connection of Orc and spirit, causing a profound sense of loss among themselves. What better way to express "Sever your core tradition and belief" than destroying the core of every class that is their Hero Power.

Atiesh, Greatstaff of the Guardian!

I would love to see an expansion of a legendary weapon for "non-weapon" class Heroes someday in Hearthstone. This iconic weapon is well known throughout the World of Warcraft (and you see it in the new Warcraft movie!).

The weapon carries a high cost of 7 mana but has interesting potential in late game situations. A mage could potentially have Spell Damage +1 for the rest of the game if the user doesn't use its durability. The weapon battlecry effect also adds to the fun of this legendary weapon. You will discover 3 random spells in the game and receive one of them with a nice cost discount.

Legendary Weapons in Hearthstone!

Orb of dominion from the legendary quest line as a warlock legendary weapon.

Perhaps this may 'revive' Priests? So when you include this during deck-building, you are allowed to put 1 or 2 other class spells in your deck. Notice it's spell cards so class legendaries are excluded. The downsides: 1) you are using 1 precious card slot for this; 2) the spell card from another class costs (1) more. Reason for increasing the card cost is to balance against the advantage of getting to play spells from other classes, such as possible OTK.

Priests can be much more fun, flexible and unpredictable like this. Feel that Priests need more AOE? Then just add Brawl or Twisting Nether into your deck. Feel that Priests need more aggression? Then just add Call of the Wild or Power Overwhelming into your deck. Feel that Priests need more tempo? Then just add Backstab or Execute into your deck.

Edit: Changed the art and name of the card. Added in 'It costs (1) more' for balance.

"I don't think the museum can afford that" -Harrison Jones

This little gem was made before having Taunt on your Hero was possible (or even intended).
Good stats with a downside (upside?) to giving your Hero Taunt.

It's like an army in your pocket!

Seeing Malfurion shapeshifting is a legendary even by its own. The master druid finally takes a form. I tried to keep it balanced and simple. All forms are made in order to fit somewhere. I consider them pretty strong although.

Ferral

 Tree of Life

 Moonkin

RAWRRRRRRRRRRRRRRRRRRR!

NO MORE HIDING !!!!!!

"Im looking for the Golden Monkey"