The idiom "shifting sands" refers to something that is constantly changing, unstable, or difficult to predict or control. It can also indicate uncertainty or ambiguity in a situation.

"High roller" is an idiom that refers to a person who is successful, wealthy or important. The phrase can be used to describe someone who has a high social status or is involved in activities that require a lot of money, such as gambling.

The idiom "rocket science" is used to describe a subject or task that is extremely complex and difficult to understand, especially for someone who is not an expert in the field.

The idiom "stack the deck" means to rig or manipulate a situation or game in your favor, so that you have an unfair advantage over others. It suggests that you are trying to stack cards or create conditions that will give you a better chance of winning.

The idiom "playing second fiddle" means to be relegated to a supporting role or position of inferiority, often behind someone else who is more important or successful.