Sivir is not what you would call the best champ at first. But she is one of the best leveling champs. Sivir is a nuke, and you can also call her assassin, because of how fast you can get her boomerangs going.
What you need to do with sivir is get her power and attack speed up, from there sivir can carry you. The boomerang Blade is where the power is used, because when you use this you can get there health down good and then use On the Hunt to get the attack speed even higher to get the kill.
Sivir has a great advantage over all the other champs and that is to throw multiple boomerangs at once, well one boomerang that bounces from champ to champ.
Her other advantage is Spell Shield i say that this is an advantage because when ashe uses her ult to stun you, you can use it to block her arrow, and when karthus uses his ult you can block that too.
Sivir is at her best in a group battle because you can turn on Ricochet and take them all down at once. Anouther thing you can use Richochet is for when you are going for a killing blow and the other champ is running you can use Richochet on a minon and kill that champ.
Well that is about it so ty and please rate!
I tryed to add masteries but it didnt work so i did 21 0 9 that works for me!