Vesuva

Vesuva has no intrinsic mana abilities.

If you don’t choose a land on the battlefield, Vesuva enters the battlefield untapped as itself.

Cornered Market won’t prevent Vesuva from being played (unless there’s a Vesuva on the battlefield copying nothing), since you play it before it becomes named something else.

If Vesuva somehow enters the battlefield at the same time as another land, Vesuva can’t become a copy of that land. You may choose only a land that’s already on the battlefield.