Hearthpwn

I like this competition, it's kinda restricted, but not too much, it's also kinda complicated, but at the same time not at all, it makes contenders use already existing mechanics, but still results in quite unique cards....good one! :)

Fel Addiction: I don't know what to think about this one, probably wouldn't be a very good card, but I think it would visually be a pretty damn cool effect to add on to Warlock's hero power.

Cow-a-bunga!: Right away this stuck out to be my favorite, I assume your own minion don't take any damage from doing this so it's basically a pretty conditional removal spell that is anti-tempo and often very high value.

Barracks: This is straight up better than Forbidden Ritual, but I don't think it's too strong. Tho together with Gadgetzan Auctioneer this could function as a late game draw engine for Divine Favor type of decks, which can be pretty cancer.

Vitality Harvest: I like the flavor of this card, it fit so well in Warlock! It might not see much play, but it's a nice option if for example your deck contain lots of cards that damage your hero.

Dash: This seems pretty broken in Spell Hunter obviously and really, really crap if you get it randomly in any other deck. Maybe if it at least drew a card if you had minions in your deck, but still might just be too strong in Spell Hunter even tho it's just an Arcane Intellect for one less mana.

Spelleater Mage: I like the concept, it's pretty fitting, but way too busted! If it only triggered whenever your opponent cast a spell that cost (5) or more mana I would love it and it would probably be my favorite.

Veteran Chemist: Way too broken combo possibilities with this I'm afraid. Making stuff like Malygos, Prophet Velen, Gadgetzan Auctioneer etc. cost (0) mana somewhat reliably is just too unfun for your opponent and really limits design space in general.

Midas, the Gold-cursed: Very fun flavor-wise and possibly not too broken, tho I do think it should cost 6 mana otherwise 8 health is a bit too much. You don't really wanna use hard removal on a 5-cost minion, but dealing 8 damage without using several minions can often be too hard or even worse value than hard removal.

I like all the entries, even the ones I criticized, great job everyone! :)

Midas is essentially Voodoo Hexxer without taunt?

You mean Water Elemental ?

And no, because with Midas, the freeze effect last until they die or get silenced

That Midas card is pretty cool :)

Midas seems pretty fun! :D

spelleater mage is straight-up broken, could easily be a hard-counter to so many decks. both dash and barracks seem well-balanced and totally playable in their respective decks. veteran chemist is hilarious.

have you never played a control deck? loatheb is an extremely good card, and would definitely still see play as a 2/4. in the right build this is like a permanent loatheb (x2), thwarting all clears and removal. if your only spells are, say, firelands/flamestrike/pyroblast, this completely shuts down things like dragonfire, blizzard, siphon soul - nevermind cheaper removal like eviscerate, jasper spellstone, frost bolt, etc. it would completely turn off miracle rogue. maybe mage doesn't have the strongest early game minions to capitalize on this kind of strategy, but at best it would really box in design space. a single OP 4 drop or a usable 9 or 10 mana spell would make big spell tempo mage one of the more annoying decks ever. the only way this card would be even remotely balanced is if the effect was a battlecry that countered only the next spell cast.

This is me totally nit-picking and not meant to be harmful or discouraging in any way, but Dash is a Feral Druid ability.

The Hunter ability for speed is called Aspect of the Cheetah.

Again, this is purely a semantic statement.

They all sound amazing, dash could be what hunter is missing from card draw. Think the weaker ones are vitality harvest and veteran chemist

Cow-a-Bunga! sounds like a fun way to use Frothing Berserker. And Vitality Harvest would get three draws with Acolyte of Pain. 

All sounds fun but I think "Spelleater Mage" would be a good card in Big Spell Mage

No shit Sherlock? ^^

veteran chemist + coin = OP (but i like the concept)

Veteran chemist is actually unprintable and completely overpowered because of one reason: Malygos. I can easily see a combo deck with something along the lines of Snowflipper Penguin and Malygos being absolutely busted. 

True, although it would be quite hard to position malygos and the penguin perfectly without getting rid of your burn spells in the process.

Veteran Chemist is a slightly awkward mana cheat, but it could bring up some amusing combo deck, certainly gets my vote. The Hunter one is a legit card and should exist :)

I vote for vitality harvest. I like the idea of drawing health from your own minions, it feels very warlocklike.

IMO it could be more suitable gameplay-wise as a Warrior card named something like Blood Rites.

I vote Veteran chemist for the combo potential and the really interesting design