Well, not useless but problem is if anyone is undead (and so immune non-lethal/subdual dmg) or has template which gives immunity vs mind-affecting effects it means your sitting target dummy for such foe. Also you could try use visual illussions to deceive Raelgar but he has blindfold true darkness so he can ignore any visuals and go around blind. Your best bet is to use perhaps shadow subschool spells. True theya re only 20% effective and asks you take them through advanced learning but they are better than nothing. Or if possible to do shopping between matches get UMD boosted and get some wands.