I saw the other designs for speed counters for the Aetherdrift M:tG expansion, and was inspired to make my own mini-version. I have a Sovol SV04 IDEX (dual extruder) so each part is designed to be printed with two colors. You can't tell from my make (my printer isn't tuned well), but the 1/2/3/4 are all based on the M:tG "font" for card costs.

Each pair of models is designed to be merged together in Cura after selecting the color/material/extruder for each. The "base" has space for four hidden 1mm x 10mm magnets (actual 1/32" x 3/8") - I paused the print after layer 10 (with standard .2 layers) and put a drop of CA glue with each magnet, then continue the print. You'll also need to glue one magnet onto the bottom of the shifter. I haven't glued the "insert" onto the base because it has a strong friction fit, but you can if you need to.