Frost Shock: Maybe 2 damage to a minion, the value is very big for the cost.
Whirling Zap-o-matic: this card needs to be a 3/1. I don't know, maybe it loose a lot of value, making it rare is ok. Maybe even a 2/2 but it is not a big problem.
Winspeaker: Not a popular card but it's a bit op, 4/3 is ok for it.
Neptulon: Just make it overload 2 or a 7/8 body, it's very strong, it doesn't need buffs.
Charged Hammer: I think the best way for this card is make it a 4/2 or 3/3. Doesn't need to be a 2/3.
The Mistcaller: It is showing it's a very good card, maybe transform it into a 5 mana 3/4 or 6 mage 4/5. 5/5 nop.
Warlock:
Corruption: It's not popular but 0 mana is a way too much op, maybe 1 mana and one more effect.
All the cards untill felguard are very great in my opinion, very balanced and very good.
Fist of Jaraxxus: Just make it a 3 mana deal 4 damage, is better.
Imp-losion: It's a very good card, it doesn't need any buffs, maybe you can choose any character even enemy hero.
Voidcaller: Yes, costing (5) or less is good, but I think 3/4 is ok, maybe (4) or less.
Doomguard: Very strong card but it has a horrible drawback, 5/7 or 6/6 is ok for it.
Willfred FizzleBang: Make it 3/4, I think it's better, almost no one likes it :s
Warrior:
Arathi Weaponsmith: 4/3 is ok even 3/3 is ok, you equipe a 2/2 weapon. This is a lot of stuff.
Tinkmaster Overspark: This should be 4 mana 3/2 *Choose a minion, at the end of your turn transform it into a 1/1 squirrel or into a 5/5 devilsaur.
Abomination: Very op, same as chillmaw, but it's rare and it doesn't need the dragon to active.
Captain Greenskin: Just make it 5/5, 5/4 is too less, 6/5 is too much.
Leeroy Jenkins: Maybe it 4 mana 5/2 or the 5 mana version 6/4 or 6/3 but the idea of all of your turns is nice.
Hogger: Very, very broken, I think as a 6 mana 4/5 or your gnolls 2/3 would be better, as 5/4 is just insane.
Illidan Stormrage: as 7 mana 5/7 I think is better but is the same thing, good.
The Beast and Gruul: Very good both, maybe the beast 9/8, because a turn 6 with this is very hard to remove and also gruul too, but nice to see a good buff in gruul.
Nozdormu: Very very broken, I would want to see something like 8 mana 6/8, just this, the way you made is just insane op.
Onyxia: Same, it should be 8 mana 6/8 or 6/7 With maybe "your dragons have +1 attack".
Captain's Parrot: If you make a pirate deck this is the same of "draw 2 cards". Just buff +1 life in it and it would be better.
Gelbin Mekkatorque: Doesn't need mana cost change and doesn't need buffs in stats. He only needs best inventions, maybe a 6 mana 6/5. poultryizer (don't know the correct names) at the start of your turn transform an enemy minion into a 1/1 chicken. The chicken becomes 0/2, the machine that restores life 4 life to a friendly character, and the machine that buffs things buff a random friendly minion with +1 attack or +1 life at the end of your turn/each turn and with a better body maybe 0/5.
Gazlowe: Very insane body for the cost, in my opinion it can easily be a 6 mana 3/7 or 5 mana 3/6 or 3/5 with the text instead of 1 mana spells, 1 or less cost spells.
Toshley: It's a good card, very good body (don't die for bgh) and you gain 2 spare parts, maybe stay the same thing and "your spare parts cost 0"?
Mogor's Champion: I think 8/6 is better or a 9/5, 8/6 would balance it I think.
Icehowl: Agree with the cost of 8, but 10/10 is already good. Maybe a 11/11 for something different :DD.
The Skeleton Knight: You just made the worst legendary card (in my opinion) transform into one very insane card, this is just insane man. a "5/5" if you count the stats 7+3 = 10 "same" as 5/5 for its 4 mana cost and an amazing deathrattle. The only thing I want to this card is better stats. 5 mana 6/4 or even 6/5 or 7/4 with same effect, maybe 6 mana 6/5 with deathrattle: "reveal a minion... if your costs more, return this to your hand costing 2 less", maybe even a 5/5.
This is my opinion, all other cards are very balanced and some cards are very creative better than the originals that exist in hearthstone.
Volcanic Lumberer: Has a nice concept but it's a bit op because it can stop any combo or otk deck, also I think the actual version is ok.
The rest is ok, recycle would be much better 4 mana as you made, 6 mana is just useless.
Huntards:
Starving Buzzard: As a 3 mana 2/2 I think it would be better, it was very insane in the past with 2/1 *everytime you summon a beast*, the way you made stills op.
Arcane Explosion as a 1 mana is very broken, maybe it still 2 mana deal 1 damage to all enemies? It's a not bad card but everybody prefer other bord cleaners.
Sorcerer's Apprentice: It's a nice concept but I prefer in this way, because you can combo with arcane missels etc.
Flamewaker: Just make it a 3/3 and it would be better.
Cone of Cold: It's good, the way it works now is bad, maybe deal 2 damage to a minion and 1 damage to adjacent minions and freeze them? Would be more balanced with same cost.
The others are very good, I really liked quartermaster and new version of bolvar(it can also become an insane card, but this only time can show us) .
Priest:
Mindgames: I don't know why you put it as a common, I really prefer it as an epic.
Holy Fire: Too much, 5 damage 6 health is enough, the card is already good.
Shadowform: In my opinion this should be 3 mana *change your hero power to deal 3 damage, if already in shadowform, deal 4 damage to a character* (4 damage not with hero power, 4 damage as a normal spell with target).
Betrayal: 1 mana is very cheap, I think the card should cost the same and have something more, maybe deal 1 damage / 2 damage to a minion and the effect?
Sinister Strike: 3 damage is enough. Gang Up as 2 mana is balanced, 1 mana is a bit op. (Maybe 2 mana put a copy in your hand and 2 in your deck maybe)
One-eyed Cheat: 5 mana sounds too much, I prefer this as a 3/2 or 4/1. In a pirate rogue the effect is very good for too much attack like this. You can also compare to magma rager.
Perdition's Blade: Good, I don't like this card too, maybe 3 mana 3/2 would be balanced.
Headcrack: I used to think this card is the worst spell in the game, but it has a lot of value, I think it should be 3 mana (like the actual) but you can choose any target you want, not only the enemy hero.
Poisoned Blade: This card is difficult to discuss, I thin the best way it's to make it 3 mana 1/4.
Dark Iron Skulker: 3 damage is too much, make it a 4/4 with same effect and it will be much better.
Edwin VanCleef: I prefer the actual way but yours is good too and don't die easy to bgh.
Kidnapper: With the combo this card is the same as "destroy a minion" and you also gain a copy of the minion, I only would want better stats on it, maybe 4 mana 3/3 or 5 mana 4/3, it has a big value but very bad body for its effect/cost.
Part two:
Shaman:
Forked Lightning: Lovely
Frost Shock: Maybe 2 damage to a minion, the value is very big for the cost.
Whirling Zap-o-matic: this card needs to be a 3/1. I don't know, maybe it loose a lot of value, making it rare is ok. Maybe even a 2/2 but it is not a big problem.
Winspeaker: Not a popular card but it's a bit op, 4/3 is ok for it.
Neptulon: Just make it overload 2 or a 7/8 body, it's very strong, it doesn't need buffs.
Charged Hammer: I think the best way for this card is make it a 4/2 or 3/3. Doesn't need to be a 2/3.
The Mistcaller: It is showing it's a very good card, maybe transform it into a 5 mana 3/4 or 6 mage 4/5. 5/5 nop.
Warlock:
Corruption: It's not popular but 0 mana is a way too much op, maybe 1 mana and one more effect.
All the cards untill felguard are very great in my opinion, very balanced and very good.
Fist of Jaraxxus: Just make it a 3 mana deal 4 damage, is better.
Imp-losion: It's a very good card, it doesn't need any buffs, maybe you can choose any character even enemy hero.
Voidcaller: Yes, costing (5) or less is good, but I think 3/4 is ok, maybe (4) or less.
Doomguard: Very strong card but it has a horrible drawback, 5/7 or 6/6 is ok for it.
Willfred FizzleBang: Make it 3/4, I think it's better, almost no one likes it :s
Warrior:
Arathi Weaponsmith: 4/3 is ok even 3/3 is ok, you equipe a 2/2 weapon. This is a lot of stuff.
Crush: Bad in my opinion.
Neutrals:
Core Hound: Maybe 2/3 core hound pup? More balanced.
Wargolem: Lovely
Thrallmar Farseer: Good but you need to upgrade its rarity (maybe rare or epic) because of its effect.
Big Game Hunter: 3/2 is ok but I think as epic is ok too.
Tinkmaster Overspark: This should be 4 mana 3/2 *Choose a minion, at the end of your turn transform it into a 1/1 squirrel or into a 5/5 devilsaur.
Abomination: Very op, same as chillmaw, but it's rare and it doesn't need the dragon to active.
Captain Greenskin: Just make it 5/5, 5/4 is too less, 6/5 is too much.
Leeroy Jenkins: Maybe it 4 mana 5/2 or the 5 mana version 6/4 or 6/3 but the idea of all of your turns is nice.
Hogger: Very, very broken, I think as a 6 mana 4/5 or your gnolls 2/3 would be better, as 5/4 is just insane.
Illidan Stormrage: as 7 mana 5/7 I think is better but is the same thing, good.
The Beast and Gruul: Very good both, maybe the beast 9/8, because a turn 6 with this is very hard to remove and also gruul too, but nice to see a good buff in gruul.
Nozdormu: Very very broken, I would want to see something like 8 mana 6/8, just this, the way you made is just insane op.
Onyxia: Same, it should be 8 mana 6/8 or 6/7 With maybe "your dragons have +1 attack".
Captain's Parrot: If you make a pirate deck this is the same of "draw 2 cards". Just buff +1 life in it and it would be better.
Gelbin Mekkatorque: Doesn't need mana cost change and doesn't need buffs in stats. He only needs best inventions, maybe a 6 mana 6/5. poultryizer (don't know the correct names) at the start of your turn transform an enemy minion into a 1/1 chicken. The chicken becomes 0/2, the machine that restores life 4 life to a friendly character, and the machine that buffs things buff a random friendly minion with +1 attack or +1 life at the end of your turn/each turn and with a better body maybe 0/5.
Boom Bot: 2-3 damage for me is ok.
Gazlowe: Very insane body for the cost, in my opinion it can easily be a 6 mana 3/7 or 5 mana 3/6 or 3/5 with the text instead of 1 mana spells, 1 or less cost spells.
Toshley: It's a good card, very good body (don't die for bgh) and you gain 2 spare parts, maybe stay the same thing and "your spare parts cost 0"?
Mogor's Champion: I think 8/6 is better or a 9/5, 8/6 would balance it I think.
Icehowl: Agree with the cost of 8, but 10/10 is already good. Maybe a 11/11 for something different :DD.
The Skeleton Knight: You just made the worst legendary card (in my opinion) transform into one very insane card, this is just insane man. a "5/5" if you count the stats 7+3 = 10 "same" as 5/5 for its 4 mana cost and an amazing deathrattle. The only thing I want to this card is better stats. 5 mana 6/4 or even 6/5 or 7/4 with same effect, maybe 6 mana 6/5 with deathrattle: "reveal a minion... if your costs more, return this to your hand costing 2 less", maybe even a 5/5.
This is my opinion, all other cards are very balanced and some cards are very creative better than the originals that exist in hearthstone.
Maybe... nah nah nah nah
Man, most of the cards are insane broken, principal cards I want to talk about:
Druid:
Claw: Broken, Heroic Strike from warrior is 2 mana receive +4 attack this turn.
Force of Nature: Better the atual version
Ironbark Protector: Broken
Volcanic Lumberer: Has a nice concept but it's a bit op because it can stop any combo or otk deck, also I think the actual version is ok.
The rest is ok, recycle would be much better 4 mana as you made, 6 mana is just useless.
Huntards:
Starving Buzzard: As a 3 mana 2/2 I think it would be better, it was very insane in the past with 2/1 *everytime you summon a beast*, the way you made stills op.
Explosive Shot and King Krush are a bit op, but the rest is ok.
Mage:
Arcane Explosion as a 1 mana is very broken, maybe it still 2 mana deal 1 damage to all enemies? It's a not bad card but everybody prefer other bord cleaners.
Sorcerer's Apprentice: It's a nice concept but I prefer in this way, because you can combo with arcane missels etc.
Flamewaker: Just make it a 3/3 and it would be better.
Cone of Cold: It's good, the way it works now is bad, maybe deal 2 damage to a minion and 1 damage to adjacent minions and freeze them? Would be more balanced with same cost.
Goblin Blastmage: Totally agree
Paladin:
Argent Lance: I think the card would be op, the way it's now it's ok but no one uses it because everybody plays secretin so they don't need it.
Scarlet Purifier: I think 3 damage is ok, 4 maybe is too much.
Murloc Knight as rare: Yes!
Cobalt Guardian: Extremelly broken, infinite divine shield in your turn, I think transforming it into a 5/5 or a 6/4 is enough.
Lay on Hands: 9 or 10 health is enough, it's a good card, it doesn't need buffs.
Guardian of Kings: 5/6 is too much, 5/5 is ok.
The others are very good, I really liked quartermaster and new version of bolvar(it can also become an insane card, but this only time can show us) .
Priest:
Mindgames: I don't know why you put it as a common, I really prefer it as an epic.
Holy Fire: Too much, 5 damage 6 health is enough, the card is already good.
Shadowform: In my opinion this should be 3 mana *change your hero power to deal 3 damage, if already in shadowform, deal 4 damage to a character* (4 damage not with hero power, 4 damage as a normal spell with target).
Rogue:
Cold Blood: Don't need changes
Betrayal: 1 mana is very cheap, I think the card should cost the same and have something more, maybe deal 1 damage / 2 damage to a minion and the effect?
Sinister Strike: 3 damage is enough. Gang Up as 2 mana is balanced, 1 mana is a bit op. (Maybe 2 mana put a copy in your hand and 2 in your deck maybe)
One-eyed Cheat: 5 mana sounds too much, I prefer this as a 3/2 or 4/1. In a pirate rogue the effect is very good for too much attack like this. You can also compare to magma rager.
Perdition's Blade: Good, I don't like this card too, maybe 3 mana 3/2 would be balanced.
Headcrack: I used to think this card is the worst spell in the game, but it has a lot of value, I think it should be 3 mana (like the actual) but you can choose any target you want, not only the enemy hero.
Poisoned Blade: This card is difficult to discuss, I thin the best way it's to make it 3 mana 1/4.
Dark Iron Skulker: 3 damage is too much, make it a 4/4 with same effect and it will be much better.
Edwin VanCleef: I prefer the actual way but yours is good too and don't die easy to bgh.
Kidnapper: With the combo this card is the same as "destroy a minion" and you also gain a copy of the minion, I only would want better stats on it, maybe 4 mana 3/3 or 5 mana 4/3, it has a big value but very bad body for its effect/cost.
Editing latter
Maybe... nah nah nah nah