You can use the Dragon Strike / Demacian Standard combo to get out of your own Cataclysm arenas.
Split your basic attacks on different champions at the beginning of fights to maximize damage.
Use Demacian Standard as a scouting tool when worried about incoming enemies.
Make the most out of your Icathian Surprise.
Kog'Maw can outrange most champions with his Bio-Arcane Barrage ability.
Use Void Ooze to set up a perfect Living Artillery.
The Jarvan IV Kog'Maw synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Kog'Maw, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Jarvan IV sees a very large drop in his KDA (ratio of kills and assists to deaths) when paired with Kog'Maw. His KDA went down from NaN to NaN. This negative change shows that Kog'Maw helps Jarvan IV perform worse in ranked League matches. Yet, the small difference shows that this performance change is only marginal.
When Jarvan IV plays on the same team as Kog'Maw, he observes a little increase in his complete damage dealt. This change could signal that Kog'Maw supports by providing cover for him to deal more damage or that his allyship also helps extend the game's duration. Similarly, when Jarvan IV is played together with Kog'Maw on the same side, he usually scores many fewer killing sprees than when he plays on his own. This is contrasting evidence that he is worse when playing synergisticly with Kog'Maw.
Moreover, when Jarvan IV plays with Kog'Maw on the same side, he typically receives a little more damage than when he plays alone. Taking more damage may indicate that Kog'Maw does a poor job of protecting Jarvan IV in teamfights.
There is no top companion for Jarvan IV that will always be his #1 ally. However, Kog'Maw is a good ally for Jarvan IV. By playing on the same team as Jarvan IV, he improves their win rate by 2.7% to 49.7%. This shows that there is a somewhat important strategic relationship between Jarvan IV and Kog'Maw that results in them performing stronger together than without each other.
Kog'Maw has a greater difficulty than Jarvan IV. That means you must be careful when lining up Kog'Maw comrades to fight alongside, as they will have to have a greater level of skill to be able to fight well with you.
When playing cooperatively, Jarvan IV players will likely observe an overall large increase in your team’s ability to destroy wih physical damage. When paired, these champs can provide a great amount of sustained physical damage.
In contrast, by pairing Jarvan IV and Kog'Maw together, you probably will not be granting your other allies a lot of support. Plan to include other champs on your team that neutralizes this relative hole in this pairing's capabilities.
Regardless of your Kog'Maw ally's skill level, you need to focus on maximizing your gold income, outlasting your enemies, and clearing objectives. If you follow these simple suggestions, you will do well anyway.
If you would like to learn all of the intricacies of Jarvan IV to synergize with Kog'Maw during both the laning and mid / late game phases of League, you should keep reading to master some more lessons on this champion pairing. If you listen to the build and tips presented here, you should increase your win rate by a lot.
The best finished items to include in your Jarvan IV and Kog'Maw synergy build include Goredrinker, Maw of Malmortius, and Death's Dance. When Jarvan IV combined at least these three pieces in his build, he did much better when paired up with Kog'Maw than with most other typical item sets. In fact, Jarvan IV boasted an average winrate of 49.7% helping carry Kog'Maw with these items in his kit.
To have the best likelihood of beating your oponents, you should equip the Conqueror, Triumph, Legend: Alacrity, Coup de Grace, Magical Footwear, and Cosmic Insight runes from the Precision and Inspiration rune sets. Of all the rune builds players chose for Jarvan IV and Kog'Maw pairings, this order of runes resulted in the best win rate. Notably, these runes gave a 49.7% winrate overall.
By default, tips, stats, and builds on how to pair Kog'Maw with Jarvan IV are given for every ranked division. If you want to filter the statistics and builds to a specific skill level, you may use the selection menu located earlier in the counter matchup guide.