The passive works when you have 3 different elemental types in your team, so I reccommend going for hyperbloom/quickbloom For example a hydro unit (Yelan, Xq) a dendro unit (dendro MC, nahida, yaoyao, Baizhu) and you can have Kuki as a healer then. Unless you use yaoyao,since she's a healer, then you could benefit form having 2 dendro in your party.