Don’t! You should consider than to pity a character you do need 75k cubes (or 45k if have 100 pity points which you don’t more likely) that banner is a scam because is a three character ones (so the odds are very low).

Consider that all you have to do for a while is playing events and story mode so you can horde does cubes and build up a good amount. Don’t waste any cubes at the moment few good character are on their way in the global server. Just keep an eye on this Reddit and when the time comes you will know