Lead your enemy when targeting with Noxious Blast to ensure the hit.
Use Twin Fang on poisoned stationary targets like monsters and units stunned by her Petrifying Gaze for maximum damage.
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 Cassiopeia Sivir synergy stats shown here demonstrate the areas of her gameplay that do better (or worse) when paired with Sivir, compared to her overall stats. Significant differences are areas of focus that highlight how her gameplay changes when paired with this other champion.
Overall, Cassiopeia sees a very large drop in her KDA (ratio of kills and assists to deaths) when paired with Sivir. His KDA fell from NaN to NaN. This negative change shows that Sivir helps Cassiopeia perform not as well in competitive League of Legends matches. Yet, the small difference demonstrates that this performance change is not very impactful.
When Cassiopeia is an ally to Sivir, she sees a marginal improvement in her full damage dealt. This could signal that Sivir supports by providing cover for her to dish out more damage or that her participation also helps increase the match's duration. Similarly, when Cassiopeia is played together with Sivir on the same team, he usually scores many fewer killing sprees than when she plays alone. This is contrasting evidence that she is worse when playing with Sivir.
Moreover, when Cassiopeia plays with Sivir on the same team, she typically receives a little more damage than when she fights alone. Taking more damage may indicate that Sivir does a poor job of covering Cassiopeia in team fights.
There is no universally accepted best synergy for Cassiopeia that will always be her ideal ally. However, overall, Sivir is a not very good ally for Cassiopeia. By being on the same side as Cassiopeia, she decreases their win rate by -1.4% to 48.9%. This clearly indicates that there is a negative synergy between Cassiopeia and Sivir that results in them performing not as well together than without each other.
Sivir has a much lower diffuclty than Cassiopeia. That means you don't need to be cautious when enlisting Sivir teammates to play with, as they will require a much lower level of skill to be able to do well with you.
Fighting alongside, you will likely witness an overall large increase in your team’s capability to dish out massive AD. Together, these two can tear through the other team with a lot of physcial damage.
Although, by bringing Cassiopeia and Sivir together, you will not be granting your other allies much engage. Plan to bring other champs on your team that fills this relative gap in their playstyle.
Regardless of your Sivir ally's skill level, you need to focus on increasing your gold income, staying alive by avoiding foolish fights, and clearing objectives. If you follow these simple suggestions, you should do well anyway.
To truly master Cassiopeia to synergize with Sivir during both the lane and mid / late game phases of LoL matches, you should continue reading to learn a few extra lessons on this champion pairing. If you pay attention to the build and suggestions presented above, you will grow your win rate by a lot.
The ideal items to prioritize in your Cassiopeia and Sivir synergy build consist of Seraph's Embrace, Rylai's Crystal Scepter, and Liandry's Torment. When Cassiopeia used at least these three finished items in her build, she did much better as an ally of Sivir than with most other typical builds. In fact, Cassiopeia boasted an average winrate of 48.9% when synergizing her build and playstyle to Sivir with these items in her kit.
To have the highest chance of annihilating your oponents, Cassiopeia players should use the Conqueror, Presence of Mind, Legend: Tenacity, Last Stand, Manaflow Band, and Transcendence runes from the Precision and Sorcery rune sets. Out of all the rune combinations players used for this team composition, this mix of runes yielded the best win rate. Notably, these runes gave a 48.9% winrate overall.
By default, tips, statistics, and builds on how to synergize Sivir with Cassiopeia are given for all skill levels combined. If you would like to filter the stats and builds to an individual rank, you may use the selection menu earlier in the counter matchup guide.