To be honest it's one of the base toolbox lands that I wouldn't consider messing with. Those lands being:
Bojuka Bog for recurring wasteland decks and graveyard matters decks.
Cavern of Souls not for fetching out early with your land tutors cause the decks you're playing against that you need it for will happily counter a crop rotation and laugh as you 2 for 1 yourself. But for that nice draw or late game tutor where you can have an uncounterable prime time or fatty resolve to secure you the win.
Eye of Ugin because it lets you grab fatties out of your deck
Glacial Chasm because it lets you cheese a few extra turns out in the face of certain death. (Fuck you death rite shaman and your loss of life crap)
Karakas because infinite loop as well as being able to combat sns/reanimator type decks
Vesuva/s good against blood moon effects as well as giving us extra locus copies or more bojuka bogs main board.

In the current meta I think that Cavern is a good include to evade countermagic to resolve a prime time. Now the reason why you don't run more than one is because you actually need the colored mana for other things in the deck as well as an already tight mana base.