Hello! Back again with this Sivir build that popped out after Sivir got that Q buff. It started getting popular in Korea, and now is the recommended build for her in U.GG. I don't see many pro players building it, and a good ADC streamer called CookieLoLxx adviced against going it, so take this into consideration when trying the build out. I think it has a lot of potential but then again, I'm not as good as they are. (Also, Lethality Varus is way better)

Sivir in general isn't that good right now. However, if you're looking for an oportunity to go Lethality Sivir, you have to make sure they don't have a lot of sustain to outheal your poke damage. Outside of that, you should be pretty good. A poke support is the best combo, but she really can go with anything.

In laning phase you're gonna try to look to push the wave under their turret and harass them with your Q and your support while they desperately try to get the CS they can. Remember to keep track of the enemy jungle and deep ward to avoid ganks. Try to stay out of their all-in range because you're really vulnerable to that pre-6.

If it's an all-in support, tell them to go for quick trades locking them down for your double Q and an auto-W, and back out, since you lose a lot of damage after that.

In mid-game, you're gonna look to group with your team and siege down a lane, poking them down with your Q and letting them finish off the kills. Before Dragon and Baron fights, be sure to poke them down so when the fight starts they already have a considerable HP disadvantage. The same as laningh phase, avoid staying close to their engage range, and if they get close, use your E and ult to create some space and keep poking them down. You can also use your ult aggresively to speed your team after you've poked them down.

Exact same playstyle as Mid-Game, you now just really gotta avoid getting all-in'd since you're proably gonna instantly blow up with the damage they have. You also deal a lot less damage to armor stacking targets since you're going lethality.
In the upside tho, you do deal a ridiculous amount of damage to squishy targets.