The Eidolon is indeed a grab one for the 50 Magic Jewels if you have Garuda it's just better to wait for the 45% attribute one that will come within a few months.
Go for the weapons first and then grab any Eidolon copy you feel like with the leftovers
If you aren't interested on spending too much money maybe two miracle tickets a year would be fine rather than the intense RNG some people do, I do think Snow Raphael is permanent and you can Miracle Ticket for her