The first key hero is Razor. He has always been a lane dominator thanks to Static Link, so this is nothing new. He always had problems in two other categories, however.
First, he was a mediocre farmer, which meant that when things don’t go his way he starts falling behind. The new Unstable Current AoE damage helps in this regard.
Second and much more important for this strategy - he has no disables. This made him a bit awkward to fit into a lineup. He was not a hard-carry damage dealer, but he was also not a utility core hero. The slow from Plasma Field and more importantly – Rod of Atos solve this problem to a large degree. It helps him stick to targets with Static Link, which increases his impact in fights, but it also helps his whole team do the same.