Camille's shield only works against one damage type, so hit her when she's vulnerable to your damage.
The Hextech Ultimatum has a very short range to cast, so try to flash away from her before she gets close.
The stats shown here clarify several important Yuumi vs. Camille counter stats that may help us distinguish the differences between the two. As an example, Yuumi’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Camille’s ratio of NaN, indicating that Yuumi may be more central to her team's team fighting capability than Camille. This observation is in large part a result of the differences in assists.
Yuumi normally has a significantly smaller longest killing spree than her matchup does. Typically, she receives less damage than Camille. This often reflects different amounts of tankyness, but it can also illustrate that the champ with higher health has less agility and thus is not able to flee from further harm when poked or engaged.
Both League champs are great champions. Both champs have their pros and cons. In League's current meta, Yuumi usually loses when facing off against Camille, with a 48.0% win rate. As a result, Yuumi makes a bad counter to Camille.
While Yuumi does have a lower winrate compared to Camille, when on opposite teams, Yuumi also has a lower level of difficulty that makes her a less time consuming character to learn and master. You may get destroyed when picking Yuumi into Camille.
Moreover, Yuumi has a lot of CC and other utility, a similar amount to Camille. 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 in League of Legends, in Yuumi vs Camille matchups, Camille 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 late stage team fights.
Yuumi is a trash counter for Camille. You will do well by focussing your actions on keeping up your CS and taking out objectives. If you are able to do that, you should be able to stand on your own as Yuumi against Camille.
To truly master Yuumi to counter Camille during both the early game and mid / late game phases of League of Legends, you should continue reading to learn a few extra lessons on this matchup. If you listen to the build and suggestions displayed here, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Yuumi on average picks up a lot less CS as Camille. Champs who typically don't get much CS typically don't have to have much CS to be effective, such as supports. 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 many items to be effective. In either situation, try to exceed the numbers shown on this page to do well.
The top items to use in your Yuumi versus Camille build include Ardent Censer, Dream Maker, and Staff of Flowing Water. When Yuumi used at least these three items in her build, she did a lot better when fighting Camille than with most other commonly used builds. In fact, Yuumi had an average win rate of 48.0% when countering Camille with these items in her kit.
To have the highest probability of vanquishing Camille as Yuumi, Yuumi players should use the Summon Aery, Manaflow Band, Transcendence, Scorch, Font of Life, and Revitalize runes from the Sorcery and Resolve rune sets. Out of all the rune combinations players chose for Yuumi vs Camille face-offs, this blending of runes yielded the best win rate. Moreover, these runes averaged a 48.0% win rate overall.
If you want to view Yuumi versus Camille tips and builds for a an individual rank, please choose one from the selection menu shown above. If viewing for the first time, the stats and strategies given are computed using all games with data with these champions.