this a really good build i use every time i play vayne
use codem to only shoot ppl in wall or to safe ur self or ur mates!
codem get used to just push away in a fight while pancing or just using it while malzahar or warwick is using a utli on some on but serios dont do that they will be pissed...
and if ur on a team with jarvan and he box the enamies in DONT Use your codem cause they will get outside the little box thing.. and then the jarvan gets pissed the samme is with galio or ammunu the same will happen .. and with anvians wall

use this to last hit so good way hit a minion 2 times wait until the minions have hitted ur target down then u can use ur silver bolt. but dont wait to long then ur stack will exspire. so target those minions who ar getting attacked by your minions then ur sure in getting last hit

tumble is simpel use it hit the enamies get em low but dont be toooooo agressive!u will die and if you cant kill the bot lane ur against just only do last hit and but still give them a little tumble and wait to ur jungler will gank! then get a kill and buy the bf sword :)!

ur roll here (in my opioin) is to take down the two most sqishy targets on the enamies team! you take their carry shoot them in the wall with codem then just focus the secound most sqyiest and take him out fast (dont focus the support) then just take the tank down with the cleaver!
then you have already won

those items is prbly the best i think but if you have a bad early game ur screwed but thats why you have to last hit to the bf sword and then you will own but remember always have some health like frozen mallet or if they have many aps then take a banshee's vail or guardin angel would be good to.
if bad early game you can always buy a dorans blade more or just wiggels lantern! this will safe you a bit buy pots to just sell the lantern when you get blood thirster

those masteries did my friend set and i just play with them their really good but maybe there is better who knows???

those runes i made my self. my friends say that their bad BUT WHAT EVER I HAVE CRIT CHANCE! but their really good cause if you shoot at the enamy bot lane you might get lucky and crit 150+ on them which is a good little start to a kill and the armor is just when playin vs other carries in the early game thats why i didnt chose armor per level cause it is so important to have a good start where the other carry dosent kill you to easy :)

well this is my build and i dont know if you think its good but i do use this !