A card shark - or SHARP as it is more properly termed - is someone who is "sharp" or smart at cards. They are a professional and are able to win most of the time.
When somebody plays cards and we call them a shark
They are an expert/professional player and they play to earn money from unsuspecting amateurs.
Its someone who is very skilled at what he does. Uses the skills they have to win.
To call "Uno" in a game of cards, you must have only one card left in your hand and say "Uno" before playing that card.
If you call "uno" before someone else in a game, you must say it before playing your second-to-last card. If you forget to say "uno" and another player notices, you may have to draw extra cards as a penalty.
When someone is called a "shark," it means they are highly skilled, competitive, and aggressive in a particular area, such as business or sports. It can also refer to someone who is ruthless or cunning in pursuing their goals.
If you call "Uno" on someone who doesn't have Uno, they must draw two additional cards as a penalty.
Shark babies are commonly referrred to as 'pups'.
Clubs, heart, diamond and I can't remember the other one!
You must be playing online or have two or more game cards.
Americans typically refer to a pack of playing cards as a "deck." A standard deck usually contains 52 cards, along with two jokers, making a total of 54 cards. It's commonly used for various card games and activities.