SCH mp managemeny sorta comes down to their co-healer. Just using your gcd spells for shields and dps usually balances out with the occassional Energy Drain and Lucid Dreaming, but if we have to pick up the healing slack with physick (because we just used all 3 aetherflow on lustrates and indom) and ET+Succor then our mp noticeably dips and can take a while to get back without a mana shift. Extended over a long fight and I've run on no mp for the last 3 minutes waiting for Aetherflow to come back