Here are some idioms that might be similar to what you are thinking of:
* In shining armor: This idiom refers to someone who is heroic, brave, and idealized, often used to describe a romantic partner. It is often used in a humorous or ironic way.
* Shining example: This idiom refers to someone or something that serves as a perfect model or example of a particular quality.
* Shine brightly: This idiom refers to someone or something that is successful, outstanding, or impressive.
Could you provide more context or details about where you heard this phrase? This will help me understand what you are looking for and provide a more accurate response.