Sivir Rework Idea

I had an idea for a rework for Sivir. I often see that she and Kalista are the worst adc's and have been for a long time. Feel free to leave an opinion in the comments, please be respectable and kind as I worked hard to come up with the idea.

WEAPON: Her new weapon is a light dagger. She makes them as she throws them.

PASSIVE: Her new passive is that every 3rd attack on a target causes it to explode dealing 150 (+40%) of attack damage.

ABILITY 1 (Q): When she activates her Q she gets 10/20/25/30/35% attack speed and life steal. She can go over the attack speed limit during this. Duration: 4/5/6/7/8 seconds Cooldown: 15/13/12/10/8 Mana Cost: 50/60/70/80/90

ABILITY 2 (W): When activated she forms a giant light dagger that drops from the sky dealing 100/150/200/250/300 (+20%) attack damage and AOE damage. It is about the size of Soroka's Q. Cooldown: 13/10/9/8/7 Mana Cost: 70/80/90/100/110

ABILITY 3 (E): Sivir jumps into the air dodging all damage and becoming CC immune for 1 second. She heals and restores mana for 30% of damage taken. When she jumps, she jumps back a little. This is capable of going over small walls. Cooldown: 30/25/20/15/10 Mana Cost: 90/100/110/120/130

ABILITY 4 (R) (ULT): So, there is two parts to this ult. The first part is that Sivir's passive no longer takes three hits when active it only takes one. The second part is that the movment boost (that is on her ult now) stays the same and scales the same. Her full team also heals for** 20/30/40%** damage they take (AS THEY ARE TAKING IT! THIS IS A VERY BIG TEAM FIGHT ULT) Duration: 5/6/7 seconds Cooldown: 160/120/100 Mana Cost: 100/120/150

So, to sum this all up she would need a minor VGU. She would not be a crit based ADC. I would recommend building full AD and attack speed with one life steal item. Cooldown reduction would also be very fitting as well for her 3 and 4. NEVER FEAR MY CHILDREN, HER PIZZA SKIN WOULD STILL BE PERFECT, BUT IT WOULD BE PIZZA SLICES NOW!