If you want to get hide as class skill there are two feats to use;<br/><br/>Cityslicker (http://dndtools.eu/feats/races-of-destiny--81/city-slicker--348/) (make some edit and turn it into some otherkind feat; like 'inflitrator training' or something to reflavor it and get three skills as class skills always)<br/><br/>Another is Martial Study (http://dndtools.eu/feats/tome-of-battle-the-book-of-nine-swords--88/martial-study--1879/), pick Shadow Hand maneuver (as that discipline gives you hide as class skill then). Best part is that all maneuvers are Ex or supernatural in origin. So example Cloak of Deception which asks no maneuvers to know and if you pick it after 5-6th level, then you get maneuver which allows once per encounter benefit from improved invisibillity until end of your turn. Another good maneuver is of course Shadow Blade Technique (but quite physical activity to attack and get choose from 2 rolls). Or Hand of Death (paralyze by touch but crappy save if wisdom is dumb stat and demands you pick it after 9-10th level).