Timing Janna's ultimate can push enemies away from a wounded ally or even separate enemies.
Eye of the Storm can be used on allied turrets.
Quickly firing a Howling Gale without the charge up can be used to heavily disable the other team.
The range on Living Artillery increases each rank.
Run away from Kog'Maw after he dies!!!!
Kog'Maw doesn't have a good escape ability, so he is especially prone to ganks.
Bio-Arcane Barrage allows Kog'Maw to kill Baron Nashor extremely early. It can be valuable to ward Nashor when Kog'Maw completes his Blade of the Ruined King.
The stat comparisons shown here highlight several influential Janna versus Kog'Maw matchup stats that may help you grasp the differences and similarities between the pair. As an example, Janna’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Kog'Maw’s ratio of NaN, demonstrating that Janna may be more central to her team's team fighting capacity than Kog'Maw. This observation is in large part caused by the differences in assists.
Janna normally has a significantly smaller longest kill spree than her opponent does. On average, she takes less damage than Kog'Maw. This is usually reflective of differing health capacities; however, it can also show that the champ with more HP has less mobility and thus is unable to escape further damage when poked or engaged.
Both League of Legends champs are great. Both champs have their pros and cons. In the game's current meta, Janna usually wins when trying to fight Kog'Maw, with a 55.1% win rate. Therefore, Janna makes a fantastic counter for Kog'Maw.
While Janna does have a much higher winrate than Kog'Maw, when on opposite teams, Janna also has a greater difficulty level that makes her a more difficult character to pick up and master. You don't need to be too worried when picking Janna into Kog'Mawas her relative depth means you may not be able to reach her full potential without a lot of practice beforehand.
Additionally, Janna also has a very large amount of CC and other utility, a similar amount to Kog'Maw. This often makes her just as valuable during teamfights, especially when facing champions with a lot of burst damage.
While there isn't a single best champion overall in League of Legends, in Janna vs Kog'Maw matchups, Janna is the better champ with a noticably higher win rate, more champion depth, and a similar amount of utility to help out your allied champions during late stage team fights.
Janna is a great counter to Kog'Maw. You will do well by focussing your play on maximizing your gold income and clearing objectives. If you can do that, you should hold your own as Janna against Kog'Maw.
To learn all of the intricacies of Janna in order to counter Kog'Maw during both the lane and mid / late game phases of League of Legends, you should continue reading to learn 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.
Janna on average picks up a lot less CS relative to Kog'Maw. Champs who on average don't acquire many minion kills typically don't have to have much CS to be valuable teammates, such as sup champs. They are able to scale well off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically require many items to be effective. In either situation, try to exceed the values displayed here to do well.
The most important items to use in your Janna versus Kog'Maw build include Shurelya's Battlesong, Ardent Censer, and Dream Maker. When Janna included at least these three pieces in her build, she did significantly better when facing Kog'Maw than with many other commonly used builds. In fact, Janna had an average win rate of 55.1% battling Kog'Maw with this counter build.
To have the highest probability of coming out on top against Kog'Maw as Janna, Janna players should take the Summon Aery, Manaflow Band, Celerity, Scorch, Eyeball Collection, and Relentless Hunter runes from the Sorcery and Domination rune sets. Of all the runes players used for Janna vs Kog'Maw counter picks, this blending of runes resulted in the highest win rate. In fact, these runes gave a 55.1% winrate overall.
If you would like to see Janna vs Kog'Maw tips and matchup stats and build suggestions for a a particular division, feel free to select one from the selection menu displayed above. If viewing for the first time, the statistics and build suggestions shown are calculated using every game played with both champs.