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As you probably already know, most rainbow decks on the market suffer from a few issues: Slightly different size cards... some cards with no borders... most faces looking very weird/different... some silly comedic backs... some one-way backs... some with differently rounded corners... and some really cheap and nasty cards.
Well, Paul Gordon has solved all the issues and his deck contains 50 duplicate Ace of Spades and the four Kings. No routine supplied, but there are many standards "out there" for which you can use these beautiful top-quality linen-finish cards.
With The Ultimate Rainbow Deck, ALL the backs are different colors and/or styles. All same stock/size. All geometrical "classic look" back designs. This is one classy deck!