Some cards allow you to add counters, or move counters, to other cards. Would you be allowed to do this onto a card that doesn't actually use any counters at all?
For example: Would Coretapper be allowed to put a charge counter on itself? What about putting one on something like Yotian Soldier?
I understand that a Charge Counter is not a +1/+1 counter, however having them around can be useful for things like Power Conduit.