Sealed Box of 8 Harry Potter Diagon Alley 2-Player Starter Sets. The Diagon Alley Starter Set contains everything 2 wizards need to play: 2- 41 card decks, including 2 exclusive premium cards (Decks do contain duplicates), 1 playmat, 1 rulebook, including hints for using new location cards, and instructions for building an advanced 60 card deck.