Improving on my previous iteration of the trick.
Play a wu-jen, or (better) a wizard with one of those PrC's that lets you steal off of other classes lists.
get the Fire Shuriken Spell.
Now add Energy Sub: Electric, Energy Admixture: Electric, Born of the Three Thunders, and Fell Drain. make sure you have Heighten Spell to go with.
A few castings per day over two weeks should get you about 50 of these. now take them to a Psychic warrior with the dissolving touch power. Read with glee the rules that magics applied to ammo apply to 50 unit and that shuriken count as ammo for this purpose. 3 pp and you have +4d6 acid on all of these.
Then, when you go out to adventure, GMW 50 of them at the start of the day.
The result?
+5 Shuriken that deal 3d6 Electricity, 3d6 Sonic, 4d6 Acid, a negative level, and a DC 18+ your INT reflex (or was it fort) save or stun for 1 round.
And you expended no XP or gold for this (unless you paid that psywar).
The question now is... What type of damage is the +5 enhacement?