Assassin/ Mage

What do you guys think of the dual assasassin / mage? I'm planning on taking the assassin through bgee and dualing around level 10 or maybe 15. I was going to drop points into locks and traps and use invis for backstabbing.

So, is this a decent combo? I like the poison weapon so far in bgee. Does the poison effect work with melf's?


Thanks!