Manamune and its Viability

As you all know, was an item that was targeted around AD casters or simply champions that are spammy and have single-target spell(s) that uses Mana. But since then this item has not been even viable for a majority of the champions including those that used to primarily built this. i.e. etc. (Do note that the Manamune build for some of these champions was long ago.)

Nowadays, it's just better to build go full Lethality ( ) than even bother going for . I still think to this day that is still an interesting item, but it just lacks incentives for building it when it is outclassed by so many other items.

This item really needs a bit of love. I'm not sure what exactly can they do, but it's better than removing this item. Maybe add an active that doubles its passive effect for 5 seconds. Or an active/passive that has the effect of Spell Weaving (An old mastery that buffs ability damage when you damage an enemy champion with basic attacks) or some form of that.