I think he might be thinking of a library for drawing / managing cards in some fashion. Over the years I've seen many shared libs in card game collections and it seems to be a relatively common thing to use or to develop when building card games.

It's quite easy to construct with a few bits of artwork, you can find the emblems for the suits in many fonts, use text drawing functionality, TextOut(x,y) kinda stuff to draw numbers and letters.

if you forgo using any images on the jacks,queens etc and just have J,K,Q etc you could do the whole things with just line drawing, filled shape drawing and outputting text.

This is a good thing to aim for as a minimum as it gives you functional card rendering without having to worry about loading/creating resources - at least to begin with.

it'll also let you scale the cards while keeping sharp graphics, do zoom animations etc

if you use a lib/method to create text as vertices instead of rendering pixels to a buffer, you can push the geometry into something like OpenGL very easily - then your scaling (if you use it) would take place on the GPU without relying on the font rendering engine to do the scaling for you (loads faster, you could easily do smooth card animations in 3D space, similar to the magic the gathering : duels of the planeswalker games - or just render flat/orthographic like microsoft solitare.

Add textures etc as a final step and you'll have a portable and generic tool for card rendering that can easily be applied to different graphic APIs.