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A few tweaks for BLU
Upping the spell slot limit from 24 to 26 would future proof BLU and still have the need to make sacrifices among what spells you include in a set.
Make Mimicry Crystals a thing. You could buy crystals with poetics that instantly give you the mimicry (one crystal for each mimicry type). The spell would remain of course as a free alternative- this is just a quality-of-life thing and another way to spend some poetics, but the price has to be reasonable (somewhere between 30 and 60 poetics) otherwise I would just keep using the spell. Whether or not the mimicry crystals should be useable inside an instance, I'm not sure (probably not).
Give BLU a triple cast spell, but make the spell itself have a cast time accordingly. The triple cast would give you at least 20 seconds to do the 3 casts. Not fussed about what the recast time would be. 'Ability' spells would not steal away one of the active instacasts when using them of course.