Hello fellow Azirer! About Azir's build, here's what I usually build on him:

- Replace
with
when you are against ap
About not going OOM, you have to really think of Azir's q as a repositioning tool for soldiers, rather than a poke ability. In lane, the ideal poke combo would be W on top of your enemy laner and auto once. He'll run out of your soldier's range and this is when you Q to him and auto twice while he is slowed by your Q. The combo in short would be:
W-Auto-Q-Auto-Auto-Thunderlord's decree procs
Most of the time, you won't be in range to W right on top of your enemy if he is ranged, then simply W-Q-Auto-Auto would work too. This ensures 3 attacks and therefore will still proc thunderlord's decree. In an ideal trade, you want to make sure you always proc thunderlord's because it contributes a lot of damage. Another thing is that you cannot realistically spam Azir's Q, since it does cost a lot of mana and should only be used when you are sure that you can pull off the combo i mentioned above by landing the Q and two autos. Poking your opponent is essential, but you have to remember that every cs = 4 mana from
and of course also some gold.
There is also blue buff to consider, but it will only be given to you a few mins into the game and even at D2, some junglers do not give blue to mid for whatever reason, so you shouldn't depend on it every game.
A straight-forward suggestion would be to get double
, since the mana regen and the passive are not unique and therefore will stack to give you a lot of mana back. People say that getting
would help, but I feel like it would delay Azir's late game god status even more and you will have no attack speed and no CDR early game without rushing
, and what would be the point of having mana if your abilities don't have impact?