the official way to decard is as follows:
Pay 100k zeny to decard 1 card out of 1 piece of equipment at a 5% chance.
If the weapon for example has 4 cards inside it, its 400k zeny per attempt to decard all cards at a 5% chance.
This gem requirement and star crumb requirement is a pserver thing and does not exist anywhere other than on pservers and was introduced back when star crumb used to be rare on low rate servers.
https://github.com/rathena/rathena/issues/5265
https://www.youtube.com/watch?v=YeYMgAlSTc4
so for the time being until we get the official card remover, i suggest to remove the annoying requirement
if not even official servers do such silly requirement, why should we?
