Some deck dividers I whipped up quickly for my brother. They are symbols for the magic lands. They are designed to be thin so they have a slight flexibility if printed in abs (which is what I print most things in) and so they don't take up too much room in a deck box. I am not positive they will fit all deck boxes so check yours before printing. Dividers are 2.7 x 3.9 inches.
Ignore the strange spots on the rendered image. I am having a driver issue after upgrading to win10 and just haven't decided to figure out and fix the issue yet. They print thick enough that there are no odd spots of light shining through them.
I printed with 10% infill, but the infill really doesn't matter if you print lots of layers for the top and bottom surfaces like I did. I didn't want to see any infill so I printed with 5 layers on top and bottom and to be honest I am not sure if it even printed a middle or if the thing is solid from the thickness of the layers. I'm sure these would print fine at larger layer heights, but I didn't bother trying because the prints are pretty fast even at 0.15mm