My favorite system only uses d10s, and they should be color coded. 9 colors are assigned, and you always have to have a random, and frequently you will need to roll two of the same color, but you also have to keep track of which color was for which effect… And as I introduce more players, I usually end up giving them a set to play with… I’m sure I’m well over $2k on this over the entire life of the hobby.