This is my first build and it's how I face-roll as Nid, I can't guarantee that you win every game as her when you use her but if you want to wreck teams she's the perfect weapon. Also A common misconception is that Nidalee is for noobs? WTF is up with that?! A good Nidalee take

PRACTICE

You may ask why the flat AP runes? simple you get the flat AP over the AP per level not to get a lot of AP but rather to do some

damage

early game! I can not stress how important it may be to get off a heal when getting ganked and have your heal actually heal!
The marks and seals are typical for any caster so I won't explain those

Not at all your typical caster masteries! But my build you will often be jumping into the fray in cougar form and you don't want to get wrecked! People tend to overlook the fact that while your in cougar form you have some dodge! So use it to your advantage and pounce in combo and pounce out!

You want to get your tear

ASAP

as soon as you get cougar, all of your cougar abilities help the passive so pounce around to get somewhere faster
After that I get boots although if they are heavy on CC be sure to grab some merc treads
next I finish the archangel to get some AP and get a rabadon's deathcap to start to hurt
a hextech gunblade is next so every spear that hurts them heals you!
I usually get a banshees next for some defense, although if your confident you can get your guinsoo's next and start dropping towers

I grab traps to put in the push an prevent any ganks and if you have a jungler to ward for him
then I grab a level 1 spear to slightly harass and keep them on their toes
from there I grab heal and max it ASAP, with a good heal you can jump in harass pop out and heal your life bar

I get ghost because who doesn't like ghost?! I mean I can now move faster to a bush and once in the bush I'm out of here!
I get flash for those tricky situations where your trap alerts you and you can get away in a dash before they CC you

Now early game your neither buff nor tanky so play smart and get those last hits, be sure to dash in and out of bush to move faster and put her passive to work After you hi 6 you should get a tear and boots and come back to lane and it's time for a double kill]
Mid game you are hurting them and they are starting to fear you, just keep harassing and farm well to get on with your build and get those kills!
Late game is where most Nidalees just throw a spear heal and wait, but not you no you throw spear->it hits->pounce in->swipe->takedown->heal yourself->spear and repeat and watch them flee in terror *insert evil laugh here*
An added note* Nidalee's spear has a lot of range so when a champ is running away low health behind tower, go around find him and snipe him with your spear! I hope to have an example up soon!

Well I hope you enjoyed my build and try out this unique new Nidalee in your next game, it's worth it!