first of all i have to say this is my first guide i hope you enjoy it, I chose vayne because in a while i wasn't pretty satisfied with any champ, but as soon as i saw her i thought "she will be the one" and fortunately i've been having a great time with her,i really like her, but whatever let's get into this

i dont really know how to add pictures jeje, but here's my point vayne needs to max her tumble as fast as she can, cause it gets less CD in late game, and u can do pretty cool combos with it, for example u are going to fight agains a melee champ you start shooting then tumble back and keep shooting, and again and again, and then u are getting your silver bolts stacked, so you can imagine how good damage you deal with it.
Also you can combine your ultimate with tumble, since you become invisible with it, you can kind of escape or counter strike your enemies, and you get extra damage too.
Condemn you really need to look the exact moment to use it and stun them against the wall, its kind the same as poppys ability just that you can use it this time with a range type, so its kinda better.

while in team fights you can use your condemn spell to push them back to your turret, just as alistar ability, or another good way to use it is when a melee champ is hitting it, cast it and they will be stunned in the turret then you can start shooting dont use your tumble now, wait till they start running then follow them with your tumble spell and they will be dead for sure

well since i dont know how to add pictures jeje, i would like if someone could tell me how to, and tell me if you liked this build i know is too simple but i think is a really good way to build vayne, ive been playing with her for 2 days and i always win with her, at least i always get the most kills and they find difficult to kill me sin i got 2.005 attack speed and lifesteal and with my tumble going back everytime someone wants to solo me and becoming stealth i really own people, so try vayne and tell me what you think, my best score with her was a 35/6 i think its really good ^^ good luck and thanks for reading this