Yuumi is too easy to play and too hard to counter
it's not the first kit to be overloaded(like syalas) but instead of the actual numbers that are op(like sylas was), it's the convienence/ease of access.
"static" stat buffs, hyper range, right click for shield, press e for heal, press w to gain a whole other champion as a shield...
I like the concept of the champ, like fusion in mangas, just needs to require more skill/risk.
and no risk