Predetors and most summoners aswell as renekton are only good earlygame, even if lvl 3.
4desert is kinda pointless, it's not doing much more than 2 dessert and does nothing for Azir. Also, Kah with no items and no assasin bonus is very weak, and sivir also needs items to be usefull, aswell as the blademaster buff.
Also, your comp has no real frontline(rek and skarner need the crystal/steel bonus to be tanky later on) and NO CC.
Also, ocean+wardens is the strongest comp atm, so yea, you 100% were supposed to loose.
1 and 2 gols cost units are basically never worth putting items on, even if lvl 3.
The carries in most compositions are usually either 3 stars or 4stars.
With renekton and reksai, what could have worked for you is going assasins, triggering steel with nocturn+rek and dessert with Kah+Rene, and focus your items on noc or kah.
Or you could have tried to built the comp more around azir, since rageblade and rabadons are prettymuch the perfect items for him.