Cards

I need to change many columns' name across multiple datasets. Is there a way to search for a particular field usage across all the cards? So after renaming columns in dataset, I could update only those cards which needed to be updated and do not have to check the fields usage in all cards. 

This is more of an instance governance question than a Builder question: I am going through the list of Cards in Admin > Cards to do some cleanup. I see dozens of cards with the same name as a drill layer I use. It shows me as the only person with access to those cards (which would not be true of the parent card if these…