James Gasik
We don't talk about Pun-Pun
I don't think you could turn someone into a dragonfly without the DM's permission- that's not a beast that has game statistics. Also, while I know it was just an example, who would imprison a spellcaster and still allow them to use their magic?Because there are many corner case scenarios where it will still be useful on an ally. Say everyone is in jail. Cast it on the cleric and turn him into a dragonfly. When the dumb insect invariably flies out of the cell through either the bars to the rest of the jail or the small window bars, stop concentrating and watch him tumble a few feet to freedom where he can help the rest of you escape.
Surely spell components, holy symbols, and focuses are going to be confiscated?
Another thing that strikes me as odd about this spell- why does polymorph use a Wisdom saving throw and not Constitution?