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.
Keeping tunnels spread out across the map will ensure you have choices when you want to cast Void Rush.
Cast Burrow before travelling around the map to take advantage of the increased Move Speed and the safety provided by Tremor Sense.
Tremor Sense can warn you of enemies closing in, and is particularly useful when entering enemy territory.
The Sivir Rek'Sai synergy stats shown here demonstrate the areas of her gameplay that do better (or worse) when paired with Rek'Sai, 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 Rek'Sai. His KDA went down from NaN to NaN. This drop shows that Rek'Sai helps Sivir perform not as well in competitive League of Legends games. Yet, the small difference indicates that this performance change is only marginal.
When Sivir is paired with Rek'Sai, she observes a small increase in her total damage dealt. This difference could indicate that Rek'Sai helps provide protection for her to deal more damage or that his presence also helps increase the game's duration. Similarly, when Sivir is played together with Rek'Sai on the same team, he usually scores many fewer killing sprees than when she plays without Rek'Sai. This is contrasting evidence that she is worse when playing alongside Rek'Sai.
Moreover, when Sivir plays with Rek'Sai on the same side, she on average receives a little less damage than when she plays alone. Receiving not as much damage could mean that Rek'Sai does a decent job of covering Sivir during team fights.
There is no universally accepted best synergy for Sivir that will no matter what be her ideal ally. Yet, overall, Rek'Sai is a top-tier teammate for Sivir. By locking into the same side as Sivir, he increases their win rate by 4.5% to 52.4%. This shows that there is a very strong strategic relationship between Sivir and Rek'Sai that results in them performing at the top of their game together than alone.
Rek'Sai has a lower difficulty than Sivir. That means you don't need to be careful when finding Rek'Sai comrades to play with, as they will require a relatively low level of skill to cooperate well with you.
Fighting on the same side, Sivir players should witness an overall large increase in your team’s ability to dish out massive AD. Combined, these champs should be able to take down targets with auto-attacks and other AD damage abilities.
Conversely, by bringing Sivir and Rek'Sai together, you probably will not be providing your other teammates a lot of magical damage output. Make sure to have other champs on your team that fills this relative gap in this pairing's kit.
Regardless of the skill of your Rek'Sai ally, you should focus on increasing your gold income, outlasting your enemies, and clearing objectives. If you do this, you should do well anyway.
If you would like to learn all of the intricacies of Sivir to work well with Rek'Sai during both the early game and mid / late game phases of League of Legends games, you should keep reading to learn some more tricks and insights into this champion pairing. If you pay attention to the build and stats presented above, you will increase your win rate significantly.
The top items to have in your Sivir and Rek'Sai synergy build include Lord Dominik's Regards, Kraken Slayer, and Navori Quickblades. When Sivir bought at least these three items in her build, she did a lot better as an ally of Rek'Sai than with most other commonly used builds. In fact, Sivir had an average win rate of 52.4% when synergizing her build and playstyle to Rek'Sai with these items in her kit.
To have the best likelihood of vanquishing your oponents, you should take the Lethal Tempo, Presence of Mind, Legend: Bloodline, Coup de Grace, Biscuit Delivery, and Magical Footwear runes from the Precision and Inspiration rune sets. Out of all the rune sets players chose for Sivir and Rek'Sai pairings, this mix of runes resulted in the highest win rate. Moreover, these runes gave a 52.4% winrate overall.
By default, tips, stats, and builds on how to team up Rek'Sai with Sivir are presented for every ranked division. If you want to scope the stats and builds to an individual rank, you should use the selection menu located earlier on the page.