Hearthpwn

Balance wise, I think it might be better as a (4) 3/3 Epic, but the main problem is choosing a card from your hand, because there is no such thing as that. Maybe you could go with a option to fix this:

The option would be to discover a card in your hand but instead of adding a copy to your hand, you would give it that it can't be discarded. The wording for that would be then: "Battlecry: Choose one of 3 cards in your hand. The one you chose can't be discarded." The wording is from Tracking, and in this way, you can't duplicate cards, but still get the effect working in a less broken way.

Well I think there could be such a thing as choosing a card from your hand. It would have to be a new UI animation, but it could work. All the cards would move upwards and you would flip through them in the same way you look at cards normally in your hand. You would click on one, confirm and that would be it. Don't limit yourself to already existing UI systems. If you have balance reasons to make it discover, we can talk about that.

I think making it a 3 mana 3/3 is fine, but a 4 mana 3/3 is Soo underpowered. The effect isn't super immediately effective, and has no tempo benefits, so to strip away even more tempo from this card would make it Unviable. I would not play this ever as a 4 mana 3/3, maybe not even a 4 mana 4/3.

I really am missing how any of that is a bad thing considering all of that can still happen and its still a bad deck no matter how you build it. I think the battlecry is the most important part, as you save your important cards and up the chances of other cards that you want to discard being discarded. Im trying to improve all of the cards you just listed, as they all are not great right now. I think if I remove anything its the self Discard protection, so you have to play the demon asap. Discard warlock needs some Op cards, because you only play op cards in standard.

I agree with your break down of shao and Binding Demon, But The problem with your Leaf casting proposal is that if ramp costs to much its basically useless. Ramp needs to be early, fast and effective, as the advantage you gain has a time limit on it. I think both effects are a overtuned, and I think changing Spring  to an empty mana crystal would be balanced. Im not sure how to balance Fall, as changing the cost is not doable at this state. Id love to hear more ideas about Leaf casting, as I think it needs some changes.

Balance-wise the stats should be 2/2, since minions with discover are usually weak. Also on a side note, would your opponent gain the card as well or not. If yes, then write it in the card (at the end of it).

Leaf Casting: I like the mana crystal and card draw part of this card a lot it fits to the theme and gives a viable replacement to Jade Blossom when they eventually rotate out of standard as well as creates a better card for ramp druid overall if you're not looking to do jades. I think if you made Fall like Savagery that would be a good balance to it. It would instead read "Deal damage equal to each full mana crystal you have to a minion". That way it is a good hard removal druid has problems with already while not being able to be a hard hitting finisher to your opponents face. Ramp druid is about getting powerful minions out quickly while keeping the board clear and I feel like this card would do both of that.

Binding Demon: I like this card as is. You're right about Warlocks not having many good 3 drops and in a discardlock the benefit of being able to lessen your rng would make other cards for warlock more viable. This card comes with some slight anti synergies as well just because if you have a Malchezaar's Imp out and it's the only card left to discard or the card you made immune to discard is left then you're not getting the card draw from the imp you're used to so it definitely requires some more planning and thinking for the class. I don't think a 4/3 for 3 mana is too bad most classes have ways to deal with these stats already but I could definitely still see it played as a 3 mana 3/3.

Mad Prophet: This card seems hilarious and I would definitely play it just to mess around with people. I agree that it should probably be a 2/2 for it's mana and effect, there aren't to many class cards that would be bad to hold in your hand so it might be too powerful at a 3/2. I love the concept though because while it has the chance to give you a good card from your class it forces your opponent to have to play around it if they can. While being given Shatter from this card as a mage and not having any freezing cards in your deck could hurt this card could just as well give your opponent the option of giving you Flamestrike, Firelands Portal or Fireball, all of which would be great to have. Love this card and concept.

Yeah it just came to mind when you guys were talking but it's not that obvious since savagery isn't seen/played much lol but my thought process for the mad prophet is while they are trying to pick the worst for you, sometimes they could only get good cards to give you especially since they are class only cards. That was my thought on that matter since most class cards aren't terrible.

Truthfully I wanted the prophet to discover a mix if class cards and neutral cards just like when you discover your own cards, but thats too much to put on the minion. So i think your right.

just to be clear only you get the chosen card and not your opponent.

I made a quickie change Ive been thinking on. Just wanted you to have to think harder while its in your hand, so I removed its self protection.