does 42 magic damage per basic attack
does 30 magic damage per basic attack
does 15 + (15% of AP) magic damage per basic attack.
Arcane Blade - Basic attacks now deal bonus magic damage equal to 5% of Ability Power.
My question is do they all stack?
ima go on a limb and say yes
Why do you think 
is so strong at the moment?
Well, the wit's end effect helps too... but you know what I meant :3
I could have sworn sated added 60 magic damage on hit
I think additive not multiplicative. So like, Basic attacks now deal bonus magic damage equal to 5% of Ability Power
if you have 1000 AP-
42 + 30 + 15 + 150 (for nashor 15%) + 50 (for 5% mastery one) = 277
Though I think doubled up once you get 
(554)
Worth on someone who has a lot of AA's on their kit anyway..otherwise..not that much for the investment.
with 300 ap this would make autos add around 147 mag damage which isnt bad at all as long as you can get a few off
First of this is a low AP build and would have to build tank since you now have to auto everything. So stated only does on hit effects. I am pretty sure that the effects of nashor and wits counts. The end build just does not make sense though.
I build stated wits and bork on shy, into tank items.
They should.
are they unique passives with the same name? no? then they stack just chcked their stats. yes they stack im curious who you will build them on
who do you plan on using this with?
