Hearthpwn

Does this make big demon Betrug+Willow warlock viable? Or the best demons are again for DH? 😁

This card is super SUPER slow.  It only works on things in your deck, THEN you have to draw them.  So if you're setting up some intricate combo you need time to assemble the pieces, and Warlock is going to struggle to get that time.

Definitely slow, but I think it could work well in some kind of control deck or handlock. Cards that you would think to run normally like abyssal summoner or that 4/4 draw 4 up to 12 become nutty with this, but still playable without it.

But what kind of control deck or handlock deck can even support this?  The Galakrond shell control deck currently used is both helped and harmed by this card.  I don't see enough other cards to keep them alive.

Voidcaller, Voidlord, and Enhanced Dreadlord will love this card in a Bloodreaver Gul'dan deck.

or just Malygos, Enhanced Dreadlord and new N'Zoth in Standart.

It's a madness!

O I misread this at first and thought it was the default health and attack switch... 

But cost and attack, now that's very interesting. 

This plus molten giant in wild is very meme lol.

This card was designed few expansions ago but it was not released because it was too OP (I think it was replaced by The Soularium).

Now as Warlock is too weak I guess they decided to print it.

Hireeknow becomes a 1 mana 8/8 that fills your board with them!! amazing 1mana play!!

1 mana 8/1, that fills your board with 8/1s

Seems like broken to me. Plenty of awsome targets already, plus the new old gods

Huh!

This was actually one of the original concepts for The Soularium, but it used to cost 7 and only affect the minions in your hand. Back then, I said that it's a bit too much like Luna's Pocket Galaxy: It's not easy to build most of your deck around a card that you need to draw and play first.

With this version, it has yet another weakness of LPG, in that your minions need to stay in the deck, though Sphere of Sapience can help with that.

Either way, the concept is very cool. Might actually result in a new Warlock deck.

Really cool card, it's gonna be fun deckbuilding with this

So Paladin got an improved version of white lady, a card that can heavily improve your deck if you can draw it early, but in paladins case it's still okay late game. 
This however is not and needs very specific combos to work out for it to be decent. So at best it can be used to buff a few specific cards, but you will also end up with many over priced minions in the deck too. 
However as a caual fun deck, it can make many fun fast combos work out occasionally. :)

Some examplea of neutral cards that can be good with this:

 
Batterhead

Malygos

Shu’ma

Khartut Defender

Shu'ma

I can’t see the edit post button

1-mana 7/7, fill your board with 1/1s!? Surely Blizzard can't be serious...! /s