Learning how to properly play AST

[Leigaon]

NEVER use Ewer on a black mage, he will hate you so much for messing up his cycle

So it's not about whether it gives them more MP to do anything it's the fact they have to break their current DPS cycle? Limits it a bit more then I guess since I don't think it helps DRK's at all, as a SMN I don't ever really have MP issues unless I'm just not paying attention. Guess that leaves it for...PLDs? Would it even benefit a bard keeping buffs up a bit longer if needed?