User blog comment:Slashingstrike/Enchantment Energizer/@comment-15077371-20160828122201

The thing is that only critical strike synergizes with very few Jungler as Riot themselfs mention which is the reason why they didn't make.

if we add attack speed to it as scaling factor it will synergize will bigger variety of junglers which i mentioned in the item description

Also items like helps alot with wave clear, which is also  / attack speed item. Energizer is based on it