Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4776645.
This is a diagonal playing card stand that is modular so that you can mix and match and create your own display.
There are three different stands the left, right, and middle. Each one has different edge sizes so you can create larger or smaller gaps between the cards when you set it up. You can use the photos as examples.
The shelf_support is sized so that you can glue it onto the bottom of the shelves to raise it above the ones in front of them (you can glue more than one of them together to raise it above the 2nd level) but you could always make your own riser if it is not the right size for what you are trying to do.
If you have any question let me know and be sure to post a picture once you set it all up!