years until an employee released an image of the card in 2006. Promotional cards Throughout the Trading Card Game, there have been many promotional cards released. There have been many error cards as well. Promotional cards have a star that indicates that they are promotional, and the "expansion" symbol is a five-pointed black star has the word "PROMO" written across as white or cloudy crystal. The first promotional set consisted of 53 cards in all with a 54th being a holographic Ancient Mew (which is not recognized as a promo card due to its nonconforming layout). 53 of the cards vary between holographic and normal, and encompass Pokémon and Trainer cards alike. The most famous of these is likely the card "Birthday Pikachu", for its uniqueness and scarcity. The second promotional set, called Best of Game, was also released by Wizards of the Coast. It included reverse holographic reprints of Hitmonchan and Electabuzz from the Base Set, Rocket's Hitmonchan and Rocket's Mewtwo from Gym Challenge, and Professor Elm from Neo Genesis. In addition, there were four new cards: Rocket's Sneasel and Rocket's Scizor from the Pokémon*VS Japanese expansion; and Dark Ivysaur and Dark Venusaur from the Pokémon Web Japanese expansion. Many were taken directly from Japanese cards, though there were a few that simply had alternate art of regular expansion cards. Most were obtainable through league or tournament play, while others were mail-in offers, or exclusive to certain retailers. There have also been "box toppers", special or secret cards that are included at the top of the booster packs in a booster box, as well as various "jumbo" cards, Skyridge for example, approximately four times the size of a regular card, and not legal in play. Under Nintendo's publishing house, the third promotional set consisted of 40 cards. The release of these cards coincided with the Pokémon Organized Play (POP) packs, and as a result, are less well documented. They were obtainable in two-card booster packs, given for winning tournaments. The fourth promotional set is based on the Diamond & Pearl era card sets with 56 total cards. The fifth promotional set is based on the Heart Gold & Soul Silver era card sets with 25 total cards. The sixth promotional set is based on the Black & White era card sets with 101 total cards. The seventh promotional set is based on the X & Y era card sets