Seems like there is token for just about everything hero / troop related. I wonder if there is a call for Elemental Hero Tokens as an item you can get for the elemental summons? Since hero types cycle every 2 days , and there are typically breaks of 2.5(?) days each month for challenge events (during Challenge Events, the elemental summons are replaced by Event Summons).
So in this case, you really only use anything like this for perhaps up to 6 days / month for a certain colored token. Besides, if everything else is the same, I don’t see how this would be game breaking feature to implement since there will be odds that you drop a Holy Token in the slot and you get a Bane in return. No different if people were to use 300 Gems or 2600 Gems for 10X Elemental summon and end up getting 3* in return, IMHO.
It may just be the most coveted types of Token though.