I believe Crane Wing/Riposte have been fixed not to work when both your hands are occupied. Spell Combat counts as occupying your offhand with spellcasting.
It used to work before.
So it appears I have to slightly modify my Sword Saint build.
Well, nuts.
In that case, what feats would you and/or
VentilatorOfDoom take instead of Crane Wing+Riposte for a Magus?
Besides the ones that seem obvious like Spell Pen, etc.
In my opinion, putting too much AC on the magus is a mistake that acts like a trap. It works well early on before level 4. After level 4 you have access to mirror image and later imp invis. Use them to tank. The ac won't matter when they can't see/hit you at all.
Instead make a strong build, suffer for a few levels the humiliation of having to send Valerie in first. Take the power attack/cleave and carmuegeon smash line. Fark your enemies up.
Oh and take the fiend bloodline and get that sweet +6 to str.
What if I'm not going Eldritch Scion and not pumping Cha? I always give Val Curmudgeon Smash anyway.
Power Attack seems just OK since you're not full BAB (although you can compensate with some of the Arcana features and True Strike) and Cleave feats don't seem that good either honestly past early game. I could be wrong but Outflank+Combat Reflexes+Seize the Moment seem like a better way to pile on the attacks, especially if Amiri or Nok-Nok is in melee with you.
Cornugon Smash is a kind of a trap in a party setting with a dedicated tank IMO. Just open with Dazzling Display on one of your more passive characters (like Val) and make everyone shaken in one go (and reduce incoming damage/lower saves of ALL enemies). Personally I'm a fan of Shatter Defenses (requires Dazzling Display), as it cripples the defenses of many enemies. It works on shaken enemies, so if you have one dedicated "aoe shaker", other characters with that feat can benefit without heavy investments in Persuasion/Intimidation & related feats.
Outflank is like mandatory whenever you get 4 BAB. That feat is just crazy.
On the other hand, from what I've read Seize the Moment does not generate double Attacks of Opportunity with Outflank, so is of limited use.
Other mandatory feats for me include Blind Fight. Probably Combat Casting - for Strenght builds at least. Weapon Spec. and Improved Crit might be worthwhile.
Then if there are still some feats left, perhaps some Critical feats: Focus & Staggering Critical. Sword Saint could aim for Blinding Critical (or maybe even Tiring->Exhausting, if you can spare 3 feats).