Hi, I'm Asgier and this is my first build on MOBAfire! I decided with todays patch to Sarah a build using her newfound hybrid abilities was necessary. This is an untested build as of now, but I'll be trying it out as soon as possible.

Pros
1. Great Carry
2. Sexy Skins
3. With this build, should do a higher dps and be somewhat better at harass due to more damage
from Make It Rain
4. Great mobility due to passive
5. Incredible AoE Ult
Cons
1. Squishy
2. Item Dependent, probably more so with this build.
3. Good carries generally need good teams.

I go with pretty standard stuff I think, lots of armor pen for higher damage output, mana per 5 flats for regen, and flat CD for all my skills.

Once again basic stuff, just lots of damage stuff.

Max Q, then W, then E. I may switch this up depending on how much damage E ends up doing with AP, but it isn't decided yet.

Exhaust for chasing/running. Flash for chasing/running. Simple stuff.

Okay, so the goal here was to maintain MF's powerful auto attacking while giving her ult, W, and E a bit more oomph.
Start with doran's blade, cause you're an AD carry who likes damage, and health, and a little bit of lifesteal.
Then, rush Sheen. This makes your Q hit with the sheen proc, doing a nice amount of bonus damage, and gives you some AP and mana to play with.

Next come your boots. Either get Zerker's or Merc's, depending on the enemy team. If you don't know how to decide this, go for Merc's.

Next, grab a Vampiric Scepter. You'll build this into a Bilgewater Cutlass later and the life steal will help you with staying in lane.

Then, grab a Pickaxe and build it into a Guinsoo's Rageblade. This item is awesome for most hybrids, especially auto attackers. You'll get stacks from your auto attacks and your abilities, which is pretty awesome.

Next, buy yourself a Best Friend Sword and build it into an Infinity Edge. This makes your auto attacks do even more damage, and gives you a chance to hit a big, mean crit.

Next, build that Vampiric Scepter from earlier into a Bilgewater Cutlass. Then build that baby into a Hextech Gunblade.

This is your pretty expensive core build. From here, play around a bit, but I personally recommend Trinity Force and Last Whisper, just because.. why not?

Q: Use it for lots of things. Biggest of all, use it for harassment. When someone is trying to farm your creep wave, shoot the creep in front of them and bounce that bullet right into their face. Also use it while auto attacking for more damage.

W: Use it when you begin a fight or when you attack a turret. Otherwise, enjoy the added damage + stacking debuff all the time! (And now it does more thanks to your fancy AP!)

E: Mainly for harassment, but now does more damage thanks to AP being in this build!

R: Oh Bullet Time. Such a wonderful spell. try to get a lane partner with a stun, or a snare. Preferably a long one. Then coordinate and rip faces open. Blast out of bushes. Through walls. Be awesome.

So.. Yeah. I haven't added much cause I haven't had the chance to play this build yet, but it's a theory, and I think it'll work well. Let me know what you think!