Concentration Token

When playing DND, I sometimes forget if I've cast a spell that requires concentration in prior rounds, so I made a token that has a slider in that I can switch quickly when my concentration status changes... e.g. cast "Guidance", switch to yes... if I want to cast another spell that requires concentration, now I know I can just look at this thing and remember that I'd break the prior spell if I do.

Admittedly, this isn't something that our group pays super close attention too, but its still n