Same as darkmoon i would say
(And that worked well before :P)

For exemple i do combine synastrie+LA+lightspeed + CO during the tornado phase on sephirot EX
It become so easy to heal everyone for all the massive damage.
Plus depending of my tank it allow a quick and huge healing after the tower

Having a spear right before this combo is really helpful XD

NEVER tried midas savage because my group don't if they do not have they sephirot weapon...