Many card games are played using a double deck of 52+2 cards where the back colors are different (e.g., in Italy it's customary to have red and blue).
Is there any game, played with such a traditional set of cards, where the back's color is meaningful?
E.g., if I play a blue 7 of Spades the outcome could be different from playing a red 7 of Spades.
PS new to the site, I probably need help with tagging...