But a Ruathar doesn't grant you sneak attack.
I'll start my Unseen Seer next week and think atm that Rogue 1 -> Wizard 4 -> Unseen Seer 2 -> Metaphysical Spellshaper 1 -> advancing Unseen Seer more is probably the best way for me to get my Sneak attack and enough skill points with the best spellcasting progression: no lost CL and only one lost level of spellcasting.
Race is human and feats will be Practised Spellcaster (obv necessary), Able Learner (necessary for the skills), Invisible Spell or some other Metamagic Feat (invisible spell should be best for sniping without beeing detected), Strongheart Vest Soulmeld (for Metaphysical Spellshaper to cast all spells silented) and Rapid Metamagic (necessary for faster casting as Metaphysical Spellshaper). Rogue could be better than Spellthief since I need Practised Spellcaster anyhow so I couldn't use the advanced CL from the Feat, so I am stuck between choosing more skill points at start (8 to be exact) or getting Steal Spell by one feat. But that feat could be taken first at level 12 since I'm not allowed to take flaws. I start that Char in the middle of level 8, so I dunno if it's worth the lost skill points.