Yuumi is busted.

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This is because she is a high elo only champion. She requires high lvl of mechanics.

I disagree with that, her w is just a noob trap. Her execution isnt that hard as long as you are doing the correct things.

you do realize that she's sub 40% Even in high elo.....

She is a hidden high skill champ. Her abilities appear simplistic, but in reality you have to manage between her passive and knowing when to and when not to be attached. On top of that you rely heavily on your teammates. That fact that people not playing her refuse to work with her contributes to part of the problem. Like the people who ban her from teammates because they have already decided she's bad without even trying to learn how to play alongside her. I believe her winrate will go up once people not only learn how to play as her, but also with her. People need to stop comparing her to Sona on top of it because she doesn't play anything like Sona.

Sona is not vulnerable when she's playing as a healer lol. Soraka really isn't vulnerable either. It's called hitting skills/spammable.

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The thing with Soraka and Sona's damage and sustain is that they in themselves are extremely vulnerable to dieing. Yuumi isn't necessarily easy to kill because of how slippery she is if she has an ally near her.

Actually she is, she is squishier than those two and if she just sit in the adc all game then its a 2v1 lane, she will have no gold, won't have any vision, and not finish her sightstone item in a reasonable time. Yuumi players instead will be weaving in and out to try and proc actually leaving them with moments of weaknesses.

Everytime i see statements like these it makes me question if people have even played the champion.

The following things supports have to do that also includes Yuumi:

Pressure lane(her Qs are not going to be enough to do that you also need to be out autoing hince why her passive rewards her for that) helping controlling the wave so you do not get shoved in(meaning again she needs to be outside the adc to do that) Warding(outside the adc again) Clearing Wards Poking(both with Q and jumping out for autos)

Her obvious weakness in comparison to Sona and Soraka is she has to do those things while being both squishier and has to be attached to heal/shield while the sona/soraka do not(hell Soraka has a global Heal).