It must never be left unattended in operation it must always be supervised by a competent adult
Commander Commander (CTRL to add secondary) Draw Draw (CTRL to add secondary) Land Land (CTRL to add secondary) Protection Teferi's Protection Until your next turn, your life total can't change and you gain protection from everything
If you want the tribal trigger Id maybe try the latter, but in all other cases Id prefer Void Shatter, as the Devoid rider means that cards like Red Elemental Blast wont work here
So if you want to see what direction to upgrade ol' Nivvy, their list is a great place to start
It does, however, have some fierce competition, Burgeoning, for instance, offers a similar strong land-playing ability that even beats Exploration in Commander