Hearthpwn

Summon: SOON! ALL OF AZEROTH WILL BURN!

Attack: You stood in the fire!

Death: Forgive me.

Purpose:  When I first thought of this card, I wanted a card that is good with Astral Communion, but also stable when you don't draw it. This card can be a stable minion in many druid deck, however, this card can throw off Combo Druids', destroying combo pieces like FON or Savage Roar, so it's being detrimental at the same time. Drawing many cards also make you susceptible to mill plays, and by having a card that's strong, but weak against a unpopular archetype such as mill, it may create artificial boost and more interesting plays. The bonus health compared to yeti is what this card deserve for being a class card and also a legendary card. (Malorne to War Golem)

Master Summoner: 

Summon: Prepare for oblivion!

Attack: You are bound to me, demon! 

Death: B-but, I'm in charge here! Aagh!

Flavor Text: All he ever wanted to do, was summon a Fearsome Doomguard...

Varian Wrynn for Warlocks. Has great potential to completely go crazy, putting in two Doomguards and a Mal'Ganis sounds great, however unlike Varian, if you discard a spell here, you really lose value. Could be good in a very demon-heavy zoo kind of deck.

How about this guy? He empowers you with fel energy so you draw more cards, but if he dies, you can no longer hold control of that power and banishes.

Neutral, so anyone can play it. Can play around discard if you play the card before this minion triggers its deathrattle.

P.D.: Baron Rivendare does not affect this deathrattle by any ways (does'nt trigger fist of Jaraxxus twice nor give tiny knight of evil +2/+2).

Flavor: Infusing yourself with fel energy is not considered doping, but  will affect negatively to your social life if you get caught.

Idea with Teron is I thought that players ought to have a reliable way to discard cards. The statline and inspire compensates for his awful affect in most situations. So there are three ways to use this guy, card draw after turn four, rushing for tempo with the huge body on 4, and discarding cards reliably. 

Sounds on Play: "I have a lot of catching up to do..."

Attack: "It gets worse..."

Inspire: "Laugh manically"

Death: "The wheel turns..." 

imgur link

Hunter has a theme of wanting an empty hand. Quick Shot Brave Archer Core Rager . Just adding to that idea and adding a tool for a spell hunter deck.

This is a really good legendary, which you can get with some Sneed's Old Shredder or Piloted Sky Golem. Though it doesn't have a real bad effect, because it doesn't necessarily discard a high-mana-cost minion. But it can discard Lord Jaraxxus or other Mal'Ganis...

Those that remember Karazhan will remember this boss and his many imp friends.

Now this card summons three random imps, that's any imps from anything in game, you could get Imp Gang Boss, Flame Imp  or Blood Imp.

But not only those unfortunately you could end up with Imps from Imp-losion, Sense Demons and Imp Master (Imp and Worthless Imp)

The card is random which means you could get two or three of the same imp if you're lucky (or unlucky).

This card guarantees an imp if you have other cards in your hand. If you play this card and only have 1 card left in your hand to discard then you will get 1 random imp. The only time you will not get an imp is if there is nothing in your hand when you play this card.

It's a fun card that I had fun thinking of. 

Flavour

Summon: Gather, my pets... there is plenty for all!

Attack: Please, accept this humble offering

Death: My life is yours, oh great one...

Wanted synergy with Astral Communion

I know others have submitted similar, but I think this one is unique enough (although there may have been a submission I missed).

The idea behind this card is that if you discard a Paladin spell, for example, you get a random Paladin spell back. A Neutral creature is randomized and given back to you, etc. 

Tihondrius

Play: I'am Tihondrius, I'am ETERNAL!

Attack: Hahahah

Death: How... Can this be...

Effect: Ha!

For this week competition I made a card which can be a little dubious (almost like any Warlock card):

If you have a terrible hand of 3, 6 or 9 cards, this one come in handy (even more perfect if you have 1 or more Fist of Jaraxxus). And works very well with Tiny Knight of Evil in your battlefield too.

For those of you who are not aware, Thathrell is a leader of a debt collector group of Tothrezim. The Tothrezim is a demon race (cousings to the Nathrezim) that construct and sells the infernals.

Edit: Made a little change to the stats, cost and text.

when Doomguard discards two cards, you will summon two random demons
A green meteor will land on the board as the animation for the demon summon 
This effect will not trigger if you dont discard a card (example summoning Doomguard with no cards in hand)

I'd like to see troggs used more.  They don't currently have any tribe mechanics, and I'm fine with that.  I like the idea of making spells very difficult to use.

This guy would be good in an opening hand, or behind any taunt.  I like the way he discourages AoE similarly to Nerubian Egg, but for a totally different reason.

You have to be really careful and know when to play this card in order to get its value. Either draw until the remainder is all you have, assert proper board control, or force massive draws on an opponent that already hit fatigue. You'll always know what you have and if you're lucky, your opponent will be caught with bad ammo.

Flavor text: Yep, we hate Millhouse THIS much.