Great set, really cool. These are just some wording changes I suggest to you.
See Ironmonger for all of the changes.
I'm not going to do a full image redo since its a small change, but it should say a "Treasure
card"
For the "during your turn change", see something like Haunted Castle. For the "draw two cards then discard two" change, see Diplomat.
For the removal of the parentheses, parentheses usually tell a rules reminder. e.g. Torturer. Otherwise, if it actually really matters, then you shouldn't have the parentheses. For the replacement of "trash a card" to "one", I think it just generally sounds better and reduces the length of the card's text. EDIT: Thanks to Gubump, I realized this probably isn't correct. Keep the last part as it was. (also, I know the image shows a semi-colon, but that was just a typo. Keep it as a period.)
First of all, what is the bottom part of this card? I don't understand it. For the removal of "immediately", see Vampire. For the changes with the playing, I think it just makes the wording simpler. For the addition of the "a" during the exchange parts, see Vampire.
I think that it should say +2 Cards,
then discard two cards, but I'm not sure.
Maybe I'm just used to it, but I would move the cost reduction part to the end. All the other dominion cards are like that (I think). For the change from a colon to a comma, see Locusts, Misery, Gamble, etc.
Again, a long text, and a small change, so I won't create an image. That said, I would make it "Then, at the start of your next turn", following Horse Traders.
For making it a Victory card, since it scores at the end of the game, it should probably be a Victory card (and Donald X., I think, has said that he would make Curse a Victory card if he could go back and change it). For the addition of "a" and the removal of "immediately", see Vampire. For the change in the wording for playing the card, I think it is simpler and sounds more like other dominion cards. For the swap of the VP to the bottom and the text to the top, see Nobles, Harem, Island, etc.
For the removal of "immediately" and the addition of "a", see Vampire. For the removal of the second to the, that was probably just a typo on your part. For the making the second part one sentence, I think it better shows that it only happens if you didn't exchange it. For the change in playing the card, I think it is simpler and more like dominion cards.
For both the non-supply cards, they should still say "(This is not in the Supply)", I just forgot to put them on.