One of League of Legends' lead gameplay designers has revealed that the upcoming patch 12.10 will target the game's healing system. The patch will bring multiple system changes as well.
As always, the mid-season is the time when we see the most change in League of Legends . The previous preseason brought many new features such as the Dragon system overall with the four Elemental Rifts.
Healing is probably one of the strongest assets a champion can have, especially in the last couple of years. Champions like Yuumi, whose kit is primarily focused on healing and shielding other champions, are pretty hard to balance and that's why she had to go through a mini-rework.
There was even a "Delete Yuumi" movement where many casual and professional players voiced their opinions about this troublesome cat, claiming that she offered no counterplay. One of Riot Games' lead gameplay designers has revealed that the next update will apparently target healing and shielding.
Reducing healing by 10-28 per cent will certainly impact the current meta and champions line Vladimir, Sylas or Soraka. Engage supports will probably take over the bot lane meta in the upcoming updates. However, there is still a chance that the nerfs won't be as impactful as the numbers present.
The GV effect seems a bit underpowered when playing against fed and naturally strong healers like Yuumi or Sylas. We weren't given the exact numbers yet but the balance team stated that they have plans to tune up the debuff that this effect brings to the game, making it more reliable and efficient in extreme situations.