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.
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.
The Kassadin Sivir synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Sivir, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Kassadin sees a large worsening in his KDA (ratio of kills and assists to deaths) when paired with Sivir. His KDA worsened from NaN to NaN. This decrease shows that Sivir helps Kassadin perform worse in ranked League rounds. Yet, the small difference shows that this performance change is not very impactful.
When Kassadin tries to synergize with Sivir, he observes a little increase in his total damage dealt. This difference could indicate that Sivir provides cover for him to deal more damage or that her allyship also helps extend the game's duration. Similarly, when Kassadin is played alongside Sivir on the same side, he usually scores many fewer killing sprees than when he plays without Sivir. This is contrasting evidence that he is worse when playing with Sivir.
Additionally, when Kassadin plays with Sivir on the same side, he usually receives a little more damage than when he fights alone. Receiving more damage could mean that Sivir does a poor job of covering Kassadin in teamfights.
There is no universally accepted best companion for Kassadin that will no matter what be his #1 synergy. Yet, overall, Sivir is a not very good ally for Kassadin. By locking into the same team as Kassadin, she drops their win rate by -2.3% to 47.7%. This proves that there is a bad synergy between Kassadin and Sivir that allows them to perform not as well together than alone.
Sivir has a much lower diffuclty than Kassadin. That means Kassadin players don't need to be very careful when arranging Sivir comrades to fight alongside, as they will require a much lower level of skill to be able to work well with you.
When playing together, you should observe an overall large increase in your team’s ability to destroy wih physical damage. Together, these two can tear through the other team with a lot of physcial damage.
Conversely, by pairing Kassadin and Sivir together, you will not be granting your side very much crowd control. Make sure to include other champions on your team that fills this relative gap in their abilities.
Regardless of your Sivir ally's ability, you need to focus on increasing your gold income, warding to avoid ambushes, and clearing objectives. If you do this, you should do well, regardless.
To truly master Kassadin to synergize with Sivir during both the lane and mid / late game phases of LoL rounds, you should continue reading to master a few extra tips and tricks for this champion pairing. If you pay attention to the build and stats displayed above, you will grow your win rate significantly.
The best items to use in your Kassadin and Sivir synergy build consist of Seraph's Embrace, Malignance, and Zhonya's Hourglass. When Kassadin used at least these three great items in his build, he performed a lot better when paired up with Sivir than with most other common item sets. In fact, Kassadin had an average winrate of 47.7% helping carry Sivir with these items in his kit.
To have the best probability of crushing your oponents, you should take the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Sudden Impact, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Out of all the rune builds that we analyzed for Kassadin and Sivir pairings, this combination of runes yielded the greatest win rate. Moreover, these runes provided a 47.7% winrate overall.
By default, tips, statistics, and builds on how to team up Sivir with Kassadin are given for all ranked divisions combined. If you want to narrow the stats and builds to a distinct rank, you should use the selection menu above.