For that sort of effect I would just use a ghosted plain. Here's what you would do:
1. Make a glow texture.
2. Make a plain. Texture it with the glow texture.
3. Position that plain at the position of the object that you want to make glow. If the object is moving then you will need to do this every loop.
4. Point the plain at the camera using the POINT OBJECT command.
That's the simplest way I can think of to do it
. Maybe using DISABLE OBJECT ZWRITE on the glowing plain would help too.
<-- Spell based team dueling game!