Looking for advise on what to draw on:

Currently have about 150 mythril. Was originally planning to be a total grinch and save everything for the Onion Knight double-USB banner, but now the renewal stuff came up. I started playing about 5 months ago, so this looks like it's going to be a massive windfall.

I'd like to have 400 to 450 mythril for the OK banner - that's 75%-80% chance of getting each USB, which is about as good as it gets I think. In the meantime, I've just started up doing Magicites - Fenrir is around 1:00, haven't tried any others yet. My weakest element is lightning (have basically nothing). Past that, I have Bartz' USB for the rest - water is the next weakest element. Much prefer physical teams, I've gotten basically no mage stuff other than Raines' BSB.

So, how many pulls do you think I can do and still keep 400 for OK, and where should I use them?

Considering:

• Crystal Tower (haven't done, can pick 2, including Kain's BSB for lightning)

• Current XV vs Kain's banner coming up shortly - both seem to have good physical lightning stuff. Second-place prizes are good on both of those too - I have Noct's SSB (only dupe) so the LMR is great, and I have zero dupes on the Kain banner.

• Tidus water banner also looks great, and that's my other weakest element. Only dupe there is Rikku's BSB.

Thoughts? Thanks!