Play your cards right!
Meaning: Make good, strategic decisions; use one’s resources to their advantage
Example: She played her cards right and got a $500 discount on her new car!
He has a card up his sleeve…
Meaning: to have an advantage that other people do not know about
Example: France’s team seems weak, but they have a few cards up their sleeves, and they might win the next game!
The cards are stacked against us.
Meaning: Someone has to face many difficulties.
Example: We have to finish this project by Monday afternoon, but the cards are stacked against us. We have little time, and our team leader is sick at home.