The title is relatively self-explanatory. For example, I have been introduced to something that I want but only a few people will get one (e.g. winning the lottery, finding a four leaf clover, or getting a certain job).
What word or phrase succinctly describes what you feel in that moment?
Edit: to clarify, there may be a chance that you'll get the thing you want, it might require a lot of luck or hard work, etc., but the idea is that you don't know. Like a mix of serendipity, despair, and determination.