Iron solari and knight' vow are designed to protect your allies; one by giing them bonus armor and magic restitance, the other by redirecting the damages they take to you; and I don't see why Yuumi w would cancel that. Zeke and abyssal mask both have: after you immobilize an enemy they take more damage" and Yummi can immobilize her ult. And finally ardent dencer give bonus attack speed and magic damage to your allies when you heal them. So yeah. It kinda work. It is not the bestest greatest option for a Yuumi build; more regular builds would definitly perform better; that's why I call this a useless build. So, you can to try it you want but remember, this is more for fun than anything. ;)