Hearthpwn

Well, here you go! Some Hunter board control, Enrage minion.

Here is my suggestion:

Here is my suggestion, I think it can be an interesting card to play. In my mind, it also have a great synergy with such cards, as Nerubian Egg , Runic Egg , Devilsaur Egg and other similar, so you can get your value immidiatly.

So, my card may be seen as a poor design and creativity skills, but I believe it is a pretty viable card. Nowadays I see no Silence in opponents deck, so this monster can be tough to pass. It is also an Elemental, so it provides additional synergy.

There are some intresting ideas in this topic, but I prefer something more common for the game, which connect all eggs, but with some "Buff".

Here is the Egg, which will hatch itself, you need only one thing - patience... And the Deathrattle effect will be under your control. Or just crack it yourself as you do.

As you see, this Imp has odd-Cost and may be even play in any deck, but his benefit will be clear in NO EVEN-COST CARD deck or if you already draw all even-Cost cards.

Here is my suggestion. This, I imagen, will be one of the coolest card to pick and play, and as always, " some random ".

The Fungalmancer

Yes, Fungalmancer is a card in K&C, But I believe that this is  pretty intresting  Idea. As for Hero and our topic of Deathwing's friend, this Mash-Shroom is the opposite of him, being "Stable" and the Deathwing is not.

Class identity

So, Fungalmancer tries to create minions with high Health, as well as to play control syle. I also add a new tribe - Mushroom, which is unique for this class.

Hero Power

His Hero Power can help you to create more powerful minion for your protection or just value trades. It can also target enemy minions, so you may be able to use on Acolite of Pain to fatigue him or to burn some cards.

Keyword

New keyword is Imitate.

It can copy abilities of your minion, enemy one and weapons, but it doesn't copy any stats or buffs.

1) Mushroom Lurker ( Classic Set ) particulary can be good for sinergy with your Mushrooms. Defenitly there are not only Mushrooms in his collection, so you may use it in a specific deck, or with some intresting cards. For example with this card:

2) This one may look too OP, but, if you put it alone, Roaring Mushroom (Basic Set) is worse than many other 4-mana drops. Can be powerful tool for value trades or can help you finally to kill your opponent, of corse if you have enought Mushrooms.

3) Glowing Spores ( Knight of the Frozen Throne Set ) Spreads the mechanic of Lifesteal, which will help you to restore Health, against many agressive decks.

4) Forbidden Rites (Whisper of the Old Gods Set) is one of my favorit suggestions. You can compare it with Forbidden Shaping or Forbidden Ancient . It also give around 20 stats for 10 Mana. But this one, as you see, you may cast only when you have a minion. I think that the most profitable way to use it is to play it on Taunt minion.

5) Thessera (Journey to Un'Goro Set) is that required Dragon. I think Mushrooms are not fond of Elementals and their activity ( He-He-He-He ). As in WOW, Thessera helped us to stop some kind of Strom in Darkshore area.

Here is my idea. I believe that Overload mechanic is too rarely develops. This card would also help Shamans to develop their battlefield. In some cases it is similar to Proffessor Putricide , and the Mysterious Tome. And there are NO MISTAKE in name. I searched wowhead for a Troll in Snows.

P.S. For some reasons my card doesn't appear throught Insert image

So, here is my idea. I really enjoy the Portal theme as well as 1/1 for (1) mana for rougues. This card defenitly better than warrior's Gather Your Party, cause it cost too much for this effect.

Next Keyword : Consumption

So, Consumption activates when You gain a Mana Crystal (Doesn't matter, coin, innervate, natural mana growth at the start of your turn or somehow else). It can have positive and negative impact. 

Small details: If you have 4 Mana and play a card with Consumption, at the next turn you will still have 4 Mana and so on other turns, until your minion with Consumption finally dies. And even worse, you can loose all your mana, if you control 2+ minions with this keyword and start your way to 10 mana again.

I hope you like this suggestion.
Next keyword is Storyteller.

EDIT: How do you make your Cards so huge in size?

There is nothing better than

7/6/6

Stealth
Battlecry: Deal damage equal to this minion's Attack.