Trick spells are both simple and difficult to cast at the same time. That is they are deceivingly simple to most people. They do have the advantage that if they fail there are very little or no bad effects.

The downside with these spells is that they often do not have long lasting times. Unless you are an experienced caster most of these spells will appear to have failed when in reality they succeeded but for such a small period of time no effect was visible.