When Kayn is in terrain near you, you will get a visual warning on the edge of the terrain he's in.
Damage Kayn while he's in Shadow Step to shorten its duration, or apply hard crowd control (stun, charm, knockup, etc) to end Shadow Step immediately.
Umbral Trespass requires Kayn to damage a target first. Try to dodge Blade's Reach to deny him a long range cast of Umbral Trespass.
The stats provided here clarify some important Samira vs. Kayn counter stats that can help us appreciate the distinctions between the two. For instance, Samira’s KDA ratio ([kills + assists] / deaths) of NaN is more than Kayn’s KDA ratio of NaN, showing that Samira may be more central to her team's team fighting potential than Kayn..
Samira often has a slightly larger longest kill spree than her matchup does. Commonly, she receives less damage than Kayn. This is usually reflective of differing health capacities, yet it can also show that the one champ has less agility and thus is not able to escape further damage when engaged or poked.
Both LoL champs are great champions. Both have their pros and cons. In League's current meta, Samira usually wins when facing off against Kayn, with a 52.1% win rate. Therefore, Samira makes a good counter to Kayn.
While Samira does have a higher win rate than Kayn, when they face off with one another, Samira also has a lower learning curve that makes her a less complex champ to learn and master. You should be be fine when picking Samira into Kayn.
Furthermore, Samira has only a small amount of utility and CC, a similar amount to Kayn. This makes her just as valuable during team fights, especially when facing champions with a lot of burst damage.
While there is not one best champion for every situation in League of Legends, in Samira vs Kayn matchups, Samira is the better champion with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your team members during teamfights.
Samira is a good counter to Kayn. You will do well by focussing your tactics on maximizing your CS and clearing objectives. If you do that, you should be able to stand on your own as Samira against Kayn.
To truly master Samira to counter Kayn during both the early game 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 here, you will grow your win rate by a lot and be that much closer to League of Legends pro players.
Samira often gets much more CS relative to Kayn. Champions who typically don't get many minion kills typically don't need much CS to be effective, such as supports. They are able to scale well off of their abilities and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually require a lot of items to be effective. In either case, try to do better than the values shown here to do well.
The most important items to focus on in your Samira versus Kayn build consist of Immortal Shieldbow, Infinity Edge, and Bloodthirster. When Samira incorporated at least these three pieces in her build, she did much better when fighting Kayn than with most other typical item sets. In fact, Samira boasted an average winrate of 52.1% when playing against Kayn with these items in her kit.
To have the highest chance of crushing Kayn as Samira, you should use the Conqueror, Triumph, Legend: Bloodline, Last Stand, Treasure Hunter, and Taste of Blood runes from the Precision and Domination rune sets. Of all the rune sets players chose for Samira vs Kayn clashes, this set of runes yielded the highest win rate. Moreover, these runes provided a 52.1% winrate overall.
If you need to see Samira vs Kayn tips and matchup stats and build suggestions for a a particular rank, feel free to choose one from the selection menu displayed above. By default, the statistics and guides displayed are calculated using all matches finished with both champions.