Chaos Wand

This wand teems with chaotic energy, connected to a seemingly endless supply of raw magic. This unpredictable devices generates any number of strange and powerful effects each time it is used (activating it is a standard action). While the user can exert some control over the target of the wand's effects, that control is limited at best, though it does improve with use.
When activating the wand, roll 3 d20 to determine the types of effects that trigger. Any targets are chosen before learning of the exact effects, though the general effect (target friendly or hostile, area friendly or hostile, self, object, etc.) are known when choosing.
Repeated use of the wand over time gives the wielder an increased sense of the state of the wand's energies moment to moment, allowing them to time the exact release of energy to improve the chances of a positive (or at least more controlled) result. The player should track each use of the wand in combat (or other stressful situations), and note every 10th use to the DM.