go to www.oddditty.biz and download the free ODF Magic effects (I think they are on page 2 of the list now), and the go to www.runtimeDNA and download the BE Creatives magic effects pack (also free, and the precourser to the ODF one). Look at how they are contructed.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)