The spot in the game's original insert for the standard and square cards doesn't really handle sleeved cards that well, and it was starting to curl the corners of my card sleeves and I DON'T LIKE THAT
This is just a simple replacement holder that I think pairs really well with Clash101ers's resource holders and also ArtaiusArdent's misc token holders (both included in the pictures) to make the best use out of the default insert.
You'll have to do a little bit of cutting, remove the original card holding part of the plastic insert to get mine in there. I cut a little too much off and my card holder tends to slide under the plastic insert - I recommend you leave a bit of the inside wall of the original card hole so this printed replacement has a surface to butt up against. As you can see, it still fits snugly under the transparent red cover!
The author marked this model as their own original creation. Imported from Thingiverse.