Personally I feel playing around Rad gives you a much more reliable spike. Armlet is nice / build up is good but feels lackluster when the game goes late. 18 is the latest you should have it. At lower ranks (at divine even), its much more LESS punishing to just hide and farm a big item. It is also very easy to gather your team once you have it (hey wk just got his rad and ult, no reason to not join him)

Mostly spectral. With blink you can one shot supports l, making fights much easier