pray one pops out of an SSR eidolon ticket or a normal SSR ticket (one of my lucky as hell union members got Belial from the grab bag and their fire team is their weakest ironically).
other than that, your wallet needs to prepare it's anus cause even with rate up, good luck seeing one...
but considering DMM side eventually got a stronger Miracle ticket (for 25 drag eyes....) maybe that one lets you pick eidolons? even if it does, it'll be a while before we see it
they do until you start to lose HP.
Pride acts like R level assault (we call it small due to no pluses). but it also gives up to nearly triple it's original atk boost depending on your HP (we get another one called vigor eventually, which is the opposite of pride but the premise is still current HP affects the extra boost).
personally, i feel it's situational on how good it truly is, but you can't deny the attack boost it'll still net you. plus a lot of them get both good stats and extra effects later on so you're gonna want them either way.
at least when we can start sticking pride with vigor, it'll balance out. but for now, pride is a small assault with a situational and fluctuating bonus
but DO NOT keep yourself at low HP unless you know you can survive. to get the max bonus from Pride weapons, you need to have 5% OR LESS of your max HP remaining... that's VERY dangerous and should honestly be avoided when you can.