question

[ReloadPsi]

You'll most likely end up with two Sages later on, meaning that you'll be able to replace all your Black Magic with Summon Magic, and thus arm them to the teeth with White Magic. Give both of them Haste, have them cast it on both your (most likely) Ninjas... you get the idea. That just about approximates Hastega.

Of course if you're playing the DS version, Haste might not do what I think it does (increase the number of hits). If that's the case then I don't know if that helps you or not.