Quick from FFVI is by far the best, you get two turns of attacking, and everyone else is stopped, guaranteed...

now equip a gem box, caste quick then osmose so you don't run out of MP, do some crazy attack, I prefer two cyan Quad Slices, you get a third turn instantly but everyone else starts again, quickly cast again, and repeat. As i have said before, beat the final boss, all forms, without getting hit.

THE JACKEL