You know, LEGO is pretty magical stuff, even without the help of JK Rowling's rabble. Ever clipped a normal LEGO piece to the underside of a Duplo monstro-block? Magic. Ever connected a man's legs to his own head? Magic. Ever completed a Technic model? No, us neither, but apparently some people somewhere have.
Connect everyone's favourite blocks to the coat tails of the Harry Potter universe and something happens that's a little bit more than just 'magical'. The two combine to form a game that puts a little hocus-focus back into the staling LEGO template.