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.
Katarina's abilities deal magic damage, so even if she's building Attack Damage items, get magic resistance to counter her.
Try to save a disable for when Katarina uses her Death Lotus.
The stat comparisons provided here show several vital Cassiopeia against Katarina counter stats that can help us realize the distinctions between the two. As an example, Cassiopeia’s KDA ratio ([kills + assists] / deaths) of NaN is better than Katarina’s KDA ratio of NaN, indicating that Cassiopeia may be more central to her team's team fighting capability than Katarina..
Cassiopeia usually has a slightly smaller longest kill spree than her enemy does. Commonly, she takes a similar amount of damage to Katarina. This often reflects different amounts of tankyness; however, it can also show that the champ with higher HP has less mobility and thus is not able to escape additional harm when poked or engaged.
Both League champions are great champions. Both have their pros and cons. In the game's current meta, Cassiopeia usually wins when trying to fight Katarina, with a 51.1% win rate. Thus, Cassiopeia makes a good counter for Katarina.
While Cassiopeia does have a higher winrate compared to Katarina, when on opposite teams, Cassiopeia also has a greater learning curve that makes her a more time consuming character to pick up and master. You should be careful when picking Cassiopeia into Katarinaas her relative depth means you may not be able to unleash her full potential without a lot of practice beforehand.
Additionally, Cassiopeia also has a good amount of CC and other utility, a similar amount to Katarina. This often makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there is not a single best champion overall in League of Legends, in Cassiopeia vs Katarina matchups, Cassiopeia is the better champ with a higher win rate, more champion depth, and a similar amount of utility to help out your allied champions during late stage team fights.
Cassiopeia is a decent counter for Katarina. Focus your actions on maximizing your gold and cs and destroying objectives. If you are able to do that, you should hold your own as Cassiopeia against Katarina.
To truly master Cassiopeia in order to counter Katarina during both the laning and mid / late game phases of League of Legends, you should continue reading to gather a few extra tricks and insights into this matchup. If you pay attention to the build and stats shown above, you will increase your win rate by a lot and be closer to League of Legends pro players.
Cassiopeia often picks up a similar amount of CS as Katarina. Champions who typically don't acquire many minion kills usualy don't require much CS to be valuable teammates, such as support champions. They are capable of scaling properly off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually need several high cost items to be effective. In either case, try to exceed the numbers reported here to do well.
The most important items to use in your Cassiopeia versus Katarina build include Liandry's Anguish, Seraph's Embrace, and Rylai's Crystal Scepter. When Cassiopeia bought at least these three items in her build, she performed much better countering Katarina than with many other common counter builds. In fact, Cassiopeia had an average win rate of 51.1% battling Katarina with this build.
To have the highest probability of coming out on top against Katarina as Cassiopeia, you should take the Conqueror, Presence of Mind, Legend: Tenacity, Coup de Grace, Taste of Blood, and Ravenous Hunter runes from the Precision and Domination rune sets. Out of all the runes players used for Cassiopeia vs Katarina clashes, this blending of runes yielded the highest win rate. Moreover, these runes gave a 51.1% winrate overall.
If you would like to view Cassiopeia x Katarina tips and counter stats for a a distinct player tier, feel free to choose one from the selection menu provided above. If viewing for the first time, the stats and guides shown are computed using every match played with these champions.