I have most of my characters like this,

Master magic - all or mega all if I don't put double cut.
Master command - hp absorb
Master command - mp absorb
Master summon - mp absorb.

Then I add these
double cut, final attack - pheonix (just on cloud), w-item, w-magic, w-summon, enemy skill, long range and more

Putting on hp or mp absorb with master command makes the basic attack drain hp/mp too. Making 4 time slash or slash all really great.