these spells i find useful for each type...

Black...Meteor (FF8), Ultima (FF8/FF10), Flare (FF8/FF10)
Red...Doublecast (FFTA)
Time...Quicken (FFTA), Hastega (FF10), Slowga (FF10)
Blue...White Wind (FFTA)
White...Holy (FF8/FF10), Full-Life (FF7 - FTTA), Curaga (FF7 - FFTA)

...but of all magic, why not Black?