World Championship series cards: These cards have a different card back than the traditional Pokemon card back, dependent on the year it was used at the World Championships. The card's front border is also a matte silver, not yellow like a normal card's border. On the right corner of the card's picture is the signature of the deck's player. No cards in these series are holographic. All World Championship cards are not tournament legal, despite whether or not their normal counterparts are. These cards are not counterfeit designs.
The example here is a Rare Candy from a World Championship deck.
Below are the card backs of the World Championship cards for series 2004, 2005, 2006, 2009, and 2010. All World Championship series cards have a different color back for each year they represent.