Sivir's Boomerang Blade returns to her after reaching the max range, so you can shift position to hit enemies who would otherwise have evaded it.
Try saving Spell Shield for enemy abilities that can disable you such as stuns and roots.
Ricochet resets Sivir's basic attack timer on activation, so activating this immediately after landing a normal basic attack will maximize damage output.
Kassadin's ultimate has many uses and is on a shorter cooldown than most, use it often.
Kassadin has multiple item paths; he can go caster via Mana and Ability Power or anti-caster with Cooldown Reduction and Magic Resist.
Try to get the Ancient Golem buff to counteract Riftwalk's increasing Mana cost.
The Sivir Kassadin synergy stats shown here demonstrate the areas of her gameplay that do better (or worse) when paired with Kassadin, compared to her overall stats. Significant differences are areas of focus that highlight how her gameplay changes when paired with this other champion.
Overall, Sivir sees a large worsening in her KDA (ratio of kills and assists to deaths) when paired with Kassadin. His KDA fell from NaN to NaN. This worsening shows that Kassadin helps Sivir perform worse in competitive LoL rounds. Yet, the small difference indicates that this performance change is only marginal.
When Sivir plays on the same team as Kassadin, she gets a little drop in her full damage dealt. This difference could indicate that Kassadin does not support by providing cover for her to dish out more damage or that his support also helps increase the game's duration. Similarly, when Sivir is played with Kassadin on the same team, he usually scores many fewer killing sprees compared to when she plays on his own. This is contrasting evidence that she is worse when playing with Kassadin.
Moreover, when Sivir plays with Kassadin on the same team, she usually receives a little less damage than when she fights alone. Receiving not as much damage may mean that Kassadin does a decent job of covering Sivir in teamfights.
There is no perfect ally for Sivir that will 100% of the time be her ideal synergy. However, overall, Kassadin is a very typical companion for Sivir. By playing on the same side as Sivir, he decreases their win rate by -0.2% to 47.7%. This shows that there is only a small bond between Sivir and Kassadin that allows them to perform not as well together than alone.
Kassadin has a much greater difficulty compared to Sivir. That means you should be careful when enlisting Kassadin comrades to fight alongside, as they will have to have a much higher level of skill to be able to play well with you.
Fighting cooperatively, you should see an overall large increase in your team’s ability to dish out massive AD. Combined, these champions should be able to take down targets with auto-attacks and other AD damage abilities.
Conversely, by aligning Sivir and Kassadin together, you may not be granting your side a great deal of support. Plan to pick other champs on your team that fills this relative disparity in this pairing's playstyle.
Regardless of the skill of your Kassadin teammate, you need to focus on maximizing your gold income, staying alive by avoiding foolish fights, and clearing objectives. If you follow these simple suggestions, you should do well, regardless.
If you would like to learn all of the intricacies of Sivir in order to work well with Kassadin during both the lane and mid / late game phases of League of Legends rounds, you should keep reading to master additional tips and tricks for this champion pairing. If you listen to the build and stats shown above, you will increase your win rate by a lot.
The top finished items to focus on in your Sivir and Kassadin synergy build include Lord Dominik's Regards, Phantom Dancer, and Navori Quickblades. When Sivir combined at least these three great items in her build, she performed much better when fighting alongside Kassadin than with most other common builds. In fact, Sivir had an average winrate of 47.7% helping carry Kassadin with these items in her kit.
To have the greatest chance of vanquishing your oponents, Sivir players should use the Lethal Tempo, Presence of Mind, Legend: Bloodline, Coup de Grace, Biscuit Delivery, and Magical Footwear runes from the Precision and Inspiration rune sets. Of all the runes players used for Sivir and Kassadin pairings, this sequence of runes resulted in the greatest win rate. In fact, these runes provided a 47.7% winrate overall.
By default, tips, stats, and builds on how to synergize Kassadin with Sivir are displayed for all skill levels combined. If you would like to scope the statistics and builds to a particular skill level, you can use the selection menu located above.