BOOK SEARCH HELP!!!

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Girlfriends birthday is coming up and she has been looking for a book matching this description for years please help, here is the description she gave

"in the book a boy at first doesn't have any superpowers but his family member (uncle?) was a really important wizard (mage?) so he went to a very really prestige wizarding school. at the end we find out he had the ability to take away magical powers. he had a friend who could see in the future and when she tried to see into his future it was black. At the end we find out that it was black because she took away all of the powers. so that's why she couldn't see his future because in the future she didn't have her powers anymore. people were using the kids powers and thats why the main character had to take the powers of all his classmates
the cover was a drawing of a guy in a school universe and holding his head in one hand and had a pencil in his other hand
in the background there was the school and i think a pig flying had to do with the book