lucky bag 5* servant

Yes. That summoning is only for Paid Quartz since you will be getting at least 1 Guaranteed 5s in the gatcha.

Lucky Bags happen two times per year, these are the anniversary which is around July/August and there's one every new year. These require Paid Quartz and should cost you around 30$ if you want to be cost efficient. Also keep in mind that the free quartz that comes with buying quartz doesn't count.