if you're azir, there's no reason not to carry
he's pretty damned strong. all you need to capitalize on it is unlocked camera lol.
also being able to last hit with his basic is a must, but jesus christ. 1 item and he becomes an unstoppable truck.
his area control is just so godly there's no reason not to get either fed or just take every tower you want.
also,
is a must. i don't care what your stupid lolking or mobafire or plat+ experience tells you. it gives massive attack speed, cdr(which equals more attack speed) and 80 ap + an auto attack steroid that makes mana conservation easier(doesn't affect your soldiers, but it's very worth the price for the stats it gives anyway.
i run 18% cdr at level one, and by the time i get nashors i have all the as and am cdr capped.
this build i have is absolutely foolproof for being able to handle anyone and everyone that comes your way.
(homeguard)

massive ap, an immunity that buys you time to escape, max cdr, 1.5 attack speed, and enough magic pen to melt anyone and everyone regardless of what they decided to build.
i see so many azirs rush morello's, and while it's a good item in its own right, how often do you find anyone EVER that can heal up through a fight with azir that lasts more than 3 seconds. i can't find anyone like that.
is so damn strong on him is the same reason why it's so damn strong on pretty much every other mid lane. It gives really great stats and is extremely cost efficient. Why the heck do you think that double Morello builds were so common? It definitely wasn't for the Grievous wounds, that's for sure.