Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
The Sivir Machine
by the start of the game i try to max out boomerang blade and ricochet, the first i use to harras the enemy heroes, the second i use to bring down the minions really quick to ensure i collect alot of money... with the money you buy an item to move quicker, an item to boost your mana, an item to boost the attack speed, another item to boost attack/damage, and after that you choose your other 2 items, or you speed up your champ even more or you make it crazy baseattack,
some matches i end with 500 move speed or 330 basedamage. good luck with this build