Yes, If The class feature says "magically" , its a magical effect.
Otherwise, It isnt.
Quoted for the rest of the thread.
According to this ruling, class features allowing one to escape sentinel are, among others:
1. The conjurer Benign Transposition
2. The mobile feat
3. The diviner Portent, which is apparently totally natural and not at all magic (provided you naturally have a good AC)
4. The enchanter instinctive charm to divert the AOO that would reduce move speed to 0.
5. The illusionnist Illusory Self (to make the attack hit an illusory copy of yourself that is 100% totally not magical.
6. The graviturgist gravity well (to totally nonmagically alter the gravity to push back the Sentinel out of range)
7. The bladesing would most probably kill the sorcerer before he's killed by the sorcerer....
Actually a majority of wizard subclasses have "not magical by the strange interpretation that connecting to another plane and summoning spirits from there is a totally, non magical class ability like rage because the word "magically" isn't written in the description." abilities.
Plus, we'd like to have the stats and build of the Assassin, since it's the real enemy of the wizard (as the sorcerer won't be dangerous encased in his AMF). If you fail to do that, we'll have to settle with the Assassin NPC stats defined by the rules of D&D.