Here’s a

 double-sided counter for Magic: The Gathering. It’s got three parts: a top, a bottom, and a middle dial. The front counts from 1 to 10, and the back goes from 11 to 20. I’ve included the middle dial separately so you can swap out the number colors if you want. It’s perfect for tracking card attributes or tokens, and it’s slim enough to slide into your deck box or pocket. Plus, you can customize the colors to match your style!