Make sure to buy items that will evolve at least 1 or 2 of your spells.
Work with your teammates to set up your Ultimate and optimize damage with your passive.
Try to catch enemy carries alone to burst them with Icathian Rain.
The stat comparisons provided here emphasize some vital Kai'Sa against Yuumi matchup stats that may help you realize the distinctions between this pair of champions. As an example, Kai'Sa’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Yuumi’s KDA ratio of NaN, demonstrating that Kai'Sa may be more central to her team's team fighting potential than Yuumi. This observation is largely caused by the differences in killsdeaths.
Kai'Sa usually has a much larger longest killing spree than her opponent does. On average, she takes more damage than Yuumi. This commonly reflects differing health capacities, but it can also indicate that the one champ has less agility and thus is unable to flee from further harm when engaged or poked.
Both League of Legends champions are great champions. Both champs have their pros and cons. In the game's current meta, Kai'Sa usually wins when trying to fight Yuumi, with a 53.6% win rate. As a result, Kai'Sa makes a great counter for Yuumi.
While Kai'Sa does have a higher win rate compared to Yuumi, when on opposite teams, Kai'Sa also has a much greater difficulty level that makes her a more time consuming champ to learn. You don't need to be too worried when picking Kai'Sa into Yuumi.
Moreover, Kai'Sa has only a small amount of CC and other utility, a similar amount to Yuumi. This makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there is not one best champion in League of Legends, in Kai'Sa vs Yuumi matchups, Kai'Sa is the better champion with a noticably higher win rate, more champion depth, and a similar amount of utility to help out your allies during teamfights.
Kai'Sa is a great counter to Yuumi. You will do well by focussing your play on maximizing your gold and cs and destroying objectives. If you are able to do that, you should hold your own as Kai'Sa against Yuumi.
If you would like to truly master Kai'Sa to counter Yuumi during both the laning and mid / late game phases of League of Legends, you should keep reading to pick up a few extra tips and tricks for this matchup. If you mind the build and stats presented above, you will increase your win rate by a lot and be closer to League of Legends pro players.
Kai'Sa often accumulates much more CS as Yuumi. Champions who on average don't acquire much CS often don't require much CS to be valuable teammates, such as sup champs. They are capable of scaling properly off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, typically require many items to be effective. In either situation, try to do better than the numbers reported here to do well.
The best items to use in your Kai'Sa versus Yuumi build include Nashor's Tooth, Guinsoo's Rageblade, and Kraken Slayer. When Kai'Sa combined at least these three items in her build, she did significantly better against Yuumi than with most other common item sets. In fact, Kai'Sa had an average winrate of 53.6% when playing against Yuumi with this counter build.
To have the best chance of crushing Yuumi as Kai'Sa, Kai'Sa players should equip the Hail of Blades, Taste of Blood, Eyeball Collection, Treasure Hunter, Biscuit Delivery, and Magical Footwear runes from the Domination and Inspiration rune sets. Of all the rune combinations players chose for Kai'Sa vs Yuumi clashes, this mix of runes yielded the greatest win rate. Moreover, these runes gave a 53.6% winrate overall.
By default, tips, stats, and builds on how to beat Yuumi as Kai'Sa are shown for all skill levels, merged. To scope the stats and builds to an individual skill level, you can use the selection menu above.