Well some of those cards would have to be balanced *stares at* Shadowmourne. This is very well thought off. You should post this on Blizzard's Forum and see the reaction, with some luck you can turn this into a possibility or at least get the ball moving in the right direction.
Thank You. I have balanced Shadowmourne and i think it will be more situational with the 3/1 Same Effect. And where can i find the Blizzard Forums again? My mind is not working. :P
To the cards: Heart Strike: Reasonable, very good with Spellpower
Quel' Delar: OP. A 4/4 for 6 mana is already good enough (or too good already)
Val'kyr Warrior: Too good stats. usual are 9 stats for 4 mana (2*mana cost +1). This applies to most minions in general, f.e. chillwind yeti or shieldmasta senjin. And this card doesn't have very good stats (Oasis Snapjaw +1/+1), but also a really good effect, where you choose between an AoE, which is worth 2 mana alone (arcane explosion) or a 2 mana power of the wild (but more specialized). Too good.
Lord Marrowgar: Don't know, I don't like rating legendaries, should be okay though.
Geist: Cleave for 1 mana + a 1/3 body? You see the problem here?
Obilerate: What do you mean by "all other minions"? Are some excluded?
Sword of the Ebon Blade: OP. Not only, that it kills every 1 health minion instantly, but doesn't love durability or something, so just leave it with 1 durability and most of your enemy problem are solved. Too good.
Professor Putricide: Works for me.
Blood Queen Lana'thel: Good card, not OP.
Drudge Ghoul: OP. Bluegill Warrior has the same stats for +1 mana cost. Stonetusk Boar costs the same, but -1 attack.
Plague Strike: Same as Arcane Shot and Holy Smite, why not?
Flesh Horror: Don't know, you get a build in Arcane Explosion, so basically the yeti (4/5 stats) costs 3 mana instead of 4 - but it can't be buffed up.
Death and Decay: I know, that consecration also deals damage to the enemy hero, but that is too strong for a 3 mana card (without any drawbacks).
Death Coil: It's okay.
Bone Shield: Okay for me.
That's my short overview about your cards, hope it helps! :)
I balanced most of the cards. I didn't change Death and Decay though. It costs 1 less mana than Consecration but does not effect the enemy hero. If it did effect the hero i would have made it 4. But i am not going to change it because it will be too much like Consecration. Consecration can do just enough damage to get Lethal while this card does not.
EDIT: Stats changed to 3/4 and now costs 7.EDIT: Balanced to 3/5. Gives Friendlys +1 Health ONLY
EDIT: Balanced to just a 1/2 with Enrage +1 attackEDIT2:Deal 5 damage to one target. Cost 5.PLAGUE.
EDIT: Stat Change to 1/2 and still 4 mana. And reduce this weapons durability by 1.
Now here are some cards you get from leveling or you start with.
EDIT: 1 cost 1/1. If damaged by this Recieve PLAGUEEDIT: Deal 1 damage and give target PLAGUE
EDIT: Now is a just a 3/4 with NO BATTLECRY. Costs 3.EDIT: Deal 1 damage to all enemies at the end of each players turn for 4 turns. Cost 4 now. If Target has PLAGUE, they take 1 additional damage.
EDIT: Only gives you 6 armor and costs 4.
Tell me what you think about these card ideas. If they are balanced or not and if you would like to see these in the actual game. And any other thing you would like to say. Thank You.
EDIT: I balanced most of the cards above based on your comments about them. Tell me if they are even better now.
NOTE: This is the effect of Thassarians DeathrattleEDIT: Give target PLAGUE and restore 2 Health. 4 Cost.EDIT: Summon 2/1 Ghouls with charge until Full Board.EDIT: Balanced to 3/1 with same Effect.EDIT: Now costs 4.
More Added Cards
Here are some Cards that add plague to a target. Plague allows you to deal more Damage with certain cards.
EDIT: Card renamed to Pestilence.
More Added soon. Thanks.
Note: Death Coil <Card> was removed and became the Hero Power with a different effect.