Question: The series of poker tournaments sponsored by the corporation formerly known as "Harrah's entertainment" uses what playing cards as their official cards?

Context paragraphs:
Playing Cards Act: The Playing Cards Act is a law in Thailand that prohibits individuals from owning more than 120 playing cards that have not been registered by the Excise Department.  The current law was passed in 1943, superseding previous acts.  The Playing Cards Acts are part of Thailand's strict anti-gambling laws dating back to 1935.  To ensure legal possession of playing cards, under Section 12 of the law, a competent official has the power to enter anywhere between sunrise and sunset to conduct a search.

German playing cards: German playing cards are a style of playing cards used in some parts of Central Europe.  Playing cards ("Spielkarten") entered German-speaking lands around the late 1370s.  After much experimentation, the cards settled into new suits of Acorns ("Eichel"), Leaves ("Grün" or "Blatt"), Hearts ("Herz") and Bells ("Schelle") around 1450.  Closely related Swiss playing cards are used in German-speaking Switzerland.  The French suit symbols were derived from the German ones around 1480.  German-suited cards spread throughout Central Europe into areas that were once under German or Austrian control (Hungary, Slovenia, Slovakia, Czech Republic, Croatia, Transylvania, Banat, Vojvodina, South Tyrol, Transcarpathia, and parts of Poland).  They were also produced and used as far east as Russia until the early 20th century.  German-suited decks are not well known all over these countries including parts of Germany itself as they have been undergoing strong competition from French playing cards since the late 17th-century.  Traditional card games in which the German suits are used include Skat, Schafkopf, Doppelkopf and Watten.

Texas hold 'em: Texas hold 'em (also known as Texas holdem, hold 'em, and holdem) is a variation of the card game of poker.  Two cards, known as the hole cards, are dealt face down to each player, and then five community cards are dealt face up in three stages.  The stages consist of a series of three cards ("the flop"), later an additional single card ("the turn" or "fourth street"), and a final card ("the river" or "fifth street").  Each player seeks the best five card poker hand from any combination of the seven cards of the five community cards and their own two hole cards.  (If a player's best five-card poker hand consists only of the five community cards and none of the player's hole cards, it is called "playing the board".  If you play the board on the river, then you can do no better than tie the other player(s) in the game if no player can make a better hand than the board represents, using either or both hole cards.)  Players have betting options to check, call, raise, or fold.  Rounds of betting take place before the flop is dealt and after each subsequent deal.

French playing cards: French playing cards ("jeu de cartes") are cards that use the French suits of "trèfles" (clovers or clubs ♣ ), "carreaux" (tiles or diamonds ), "cœurs" (hearts ♥ ), and "piques" (pikes or spades ♠ ).  Each suit contains three face cards; the "valet" (knave or jack), the "dame" (lady or queen), and the "roi" (king).  Aside from these aspects, decks can include a wide variety of regional and national patterns which often have different deck sizes.  In comparison to Spanish, Italian, German, and Swiss playing cards, French cards are the most widespread due to the geopolitical, commercial, and cultural influence of France and the United Kingdom in the past two centuries.  Another reason for their expansion was the simplicity of the suit insignia which simplifies mass production and the popularity of whist, contract bridge, and the recent poker boom.

King (playing card): The king is a playing card with a picture of a king on it.  The king is usually the highest-ranking face card.  In French playing cards and tarot decks, the king immediately outranks the queen.  In Italian and Spanish playing cards, the king immediately outranks the knight.  In German and Swiss playing cards, the king immediately outranks the Ober.  In some games, the king is the highest-ranked card; in others, the ace is higher.  Aces began outranking kings around 1500 with Trappola being the earliest known game in which the aces were highest in all four suits.  In the Ace-Ten family of games such as pinochle and schnapsen, both the ace and the 10 rank higher than the king.

Copag: Copag is a company based in São Paulo, Brazil.  It started as a printing company in 1908.  The company expanded to making playing cards for poker and bridge in 1918.  Plastic playing cards are their main lineup.  With the recent poker boom, Copag's business has quickly grown.  In 2005, the World Series of Poker slated Copag as their official playing card supplier.  That same year, Copag became part of the Cartamundi group.

Flemish Hunting Deck: The Flemish Hunting Deck, also known as the Cloisters set of fifty-two playing cards and Hofjaren Jachtpakket (in Dutch), is a set of fifty-two playing cards owned by the Metropolitan Museum of Art, New York, United States.  It is significant in that it is the only complete set of ordinary playing cards from the fifteenth century.  Estimate ranges of manufacture are between 1470 and 1480.

World Series of Poker: The World Series of Poker (WSOP) is a series of poker tournaments held annually in Las Vegas and, since 2005, sponsored by Caesars Entertainment Corporation (known as Harrah's Entertainment until 2010).  It dates its origins to 1970, when Benny Binion invited seven of the best-known poker players to the Horseshoe Casino for a single tournament, with a set start and stop time, and a winner determined by a secret ballot of the seven players.

Rook (card game): Rook is a trick-taking game, usually played with a specialized deck of cards.  Sometimes referred to as "Christian cards" or "missionary poker", Rook playing cards were introduced by Parker Brothers in 1906 to provide an alternative to standard playing cards for those in the Puritan tradition or Mennonite culture who considered the face cards in a regular deck inappropriate because of their association with gambling and cartomancy.

Italian Poker Tour: The Italian Poker Tour (IPT) is a series of poker tournaments sponsored by PokerStars.  The tour was created in 2009 and has held tournaments in Italy, Malta, Slovenia and San Marino.

Supporting paragraphs: Copag World Series of Poker
Answer: Copag