Full Mana? Item or Passive Node Ideas

Can we get an Item or passive note that gives double or more critical chances while on full mana, but instead it increased skill cost or reduced mana regeneration or "Your skills don't crit unless you have full mana, your skills confirmed critical hit on full mana", Just an idea with many possibilities and opening many more builds.

there are literally no items or passive nodes on having full mana, only low mana and that's only about super few, kindly correct me if I'm wrong please.