Generally will try to boost his most accurate companions weapon with Supercharge weapon. If someone has a particularly effective weapon vs a particular target, it would pick them rather than necessarily the most accurate.
If allies are around and the battle looks to be a big one, he will haste the group.
If someone attacks in melee, he is more than happy to respond in kind with his claws, only backing away if he gets down to HP.
[dice=claw attack vs KAC]1d20+14[/dice]
[dice=claw damage (p)]1d3+19[/dice]
Against incorporeal targets he normally full-casts magic missiles. He can do this without limit.
[dice=force damage,harmful spells]3d4+3+5[/dice]
Against other distant foes he may use spells if appropriate, or may just use his unlimited magical missiles.
If he expects to get into melee, he is likely to cast mirror image or displacement. Otherwise likely to use spells as they seem appropriate. It has been a long time since he has run out of spells, so he uses them freely - as much to bolster his allies as to do direct damage.