The last time I encountered a Deck I was playing an extremely intelligent wizard who knew the chances of drawing a bad card and simply left it to anyone else as slow and steady wins the race.
The DM, voicing through my intelligent familiar decided that the familiar would draw 4 (!!!!) cards. Guess he wanted his Deck Jollies. We all then watched dumbfounded as the raven drew 4 red cards from a freshly shuffled deck, wished himself a were-raven, assumed an elfin hominid form, gained 11 levels, gained not one but two keeps, wishes, and ended up with more draws for 7 (!!!!!!!) total with not a single black card to be found.
Needless to say, everyone jumped at the deck then (except the Wizard and another character as wise as the Wizard was intelligent). Of course, the inevitable happened, characters were utterly destroyed, faced off with Minor Deaths, and were Imprisoned. I'd say the DM was a card shark except I get the feeling that kind of manual dexterity is beyond him.
Go figure.
Oh, having a familiar more powerful than you is an interesting experience. More NPC then familiar at that point, thankfully one of his ill chosen uses of a wish got him assassinated within the week.