S.: Sorry, I'm not really familiar with the forum and it's interface yet, so the file attachments should, perhaps, be viewed from the bottom to the top P
You have to get lucky to make the best of Harmonic Prodigy because, not counting prowess, there are only five wizards/shamans with relevant abilities you can copy with this card: one that provides treasures, two that give card draw, and two that give us temporary copies of our tokens
That being said, I think the reasons for a card being banned can be broken down into two main categories: A card is too powerful on its own and almost every deck has to have it to be good
I think Modern needs affinity to be better
On top of that, it also has the bonus feature of letting you configure the maximum price of the cards that you can pack