I spent a good deal of time creating a custom card with formatting and functionality. Rather than redoing those steps for 5 more custom cards, and having to repeat the process for the edit version, it would be fantastic to be able to copy and paste or duplicate a card from the Options pane (probably as an item under the ellipsis).
Quick explanation of what I was creating: I wanted an accordion style toggle to hide/show details of a fixed number of items (person and up to 5 dependents). I tried to do this with mostly standard cards and just set the visibility of the cards to a context variable, but I found that when I would show the details cards, they would always appear at the bottom of the cards, not in the order I'd set. I also set a bunch of formatting values. All that I need to change in each item is a variable name.