Kassadin's ultimate has many uses and is on a shorter cooldown than most, use it often.
Kassadin has multiple item paths; he can go caster via Mana and Ability Power or anti-caster with Cooldown Reduction and Magic Resist.
Try to get the Ancient Golem buff to counteract Riftwalk's increasing Mana cost.
Be careful about how close you let Viktor get to you. Viktor's control of the battlefield increases with his proximity to his opponent.
Be aware of how many augments Viktor has upgraded by looking at the color of the light on his staff (purple, yellow, blue, red).
The stats shown on this page underscore several significant Kassadin against Viktor matchup stats that may help us realize the differences between the pair. As an example, Kassadin’s KDA ratio ([kills + assists] / deaths) of NaN is better than Viktor’s ratio of NaN, indicating that Kassadin may be more central to his team's team fighting capability than Viktor..
Kassadin often has a slightly larger longest killing spree than his counter does. On average, he takes more damage than Viktor. This typically indicates differing health capacities, yet it can also indicate that the one champion has less agility and thus is not able to kite away from further damage when poked or engaged.
Both League of Legends champs are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Kassadin usually loses when trying to fight Viktor, with a 48.4% win rate. Therefore, Kassadin makes a poor counter for Viktor.
While Kassadin does have a lower win rate than Viktor, when on opposite teams, Kassadin also has a lower level of difficulty that makes him a less complex character to pick up and master. You still need to be cautious when picking Kassadin into Viktoras his relative depth means that you may not be able to unleash his full potential without a significant amount of practice beforehand.
Moreover, Kassadin also has some amount of CC and other utility, a similar amount to Viktor. This often makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there isn't a single best champion in League of Legends, in Kassadin vs Viktor matchups, Viktor is the better champ with a lower win rate, less champion complexity, and a similar amount of utility to help out your allied champions during teamfights.
Kassadin is a somewhat poor counter to Viktor. Focus your play on maximizing your gold and cs and destroying objectives. If you do that, you should do very well as Kassadin against Viktor.
To truly master Kassadin to counter Viktor during both the laning and mid / late game phases of League of Legends, you should continue reading to gather a few extra lessons on this matchup. If you mind the build and stats presented above, you will grow your win rate by a lot and be closer to League of Legends pro players.
Kassadin on average gets a similar amount of CS as Viktor. Champs who typically don't earn many minion kills typically don't have to have much CS to be effective, such as sup champs. These kinds of champions are capable of scaling well off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, often require many items to be effective. In either situation, try to do better than the values reported on this page to do well.
The most crucial items to focus on in your Kassadin versus Viktor build include Seraph's Embrace, Rabadon's Deathcap, and Malignance. When Kassadin incorporated at least these three pieces in his build, he performed significantly better versus Viktor than with most other common builds. In fact, Kassadin boasted an average winrate of 48.4% when countering Viktor with these items in his kit.
To have the highest chance of beating Viktor as Kassadin, Kassadin players should equip the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Sudden Impact, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Out of all the runes players picked for Kassadin vs Viktor face-offs, this sequence of runes yielded the highest win rate. Notably, these runes averaged a 48.4% winrate overall.
By default, tips, stats, and builds on how to beat Viktor as Kassadin are shown for all skill levels, merged. If you want to narrow the statistics and builds to a specific rank, you can use the selection menu earlier on the page.