Every card in 30th Celebration is foil, basic Energy included, which no previous English set has done. Packs hold six cards rather than the usual ten, and one slot in every pack goes to a Pikachu: thirty different Pikachu cards were printed for the set, so a Pikachu is guaranteed in whatever you open. The Sylveon ex Box is a four-pack product built around a foil Sylveon ex promo, and it carries an oversize foil version of the same card alongside it. RRP is £21.99. The set also includes a Classic Collection of thirty reprints reaching back to Base Set, and that subset is where most of the secondary market interest has landed. Four packs is a small opening by any measure, so this is best understood as buying the promo card with some packs attached rather than as a way to chase the set.