#dnd35 magic item thought: Wand of Invisible Enlarged Magic Missile.
260' range (due to all consequences of the Enlarge Spell feat), two missiles, and if you use it carefully there's a good chance nobody has a clue where the sudden force wounds came from.
In short, a good assassination tool... The primary trick is not being heard activating it (since by pure RAW any spell trigger item requires a word to be spoken). Definitely a highly-regulated spy gadget.