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.
well, never build a mana item on sivir,
it is wasted dmg,
with this build u deal insane dmg with ur w,
and u have enough atackspeed from runes and boots.
u just need a tank u goes in first so u can kill all enemys.
when u have a mana prob, u can get some mana with ur e and u can take blue buff.