Cutting for lands is always damn hard, but you need always to keep in mind, that the best card is useless, if you don't have the mana to play it.
Spot Removal in multiplayer is always a critical point. I try to use them in order to deny a win or removing stuff that really hurts me. For example,
Lightmine Field: If I play voltron, I don't care, but with a go wide deck, this could break my neck.
Besides that, there are some cards that I always try to remove like
Defense of the Heart. Even if the resolve doesn't end the game, it's usually something you don't want to be resolved, because it most likely changes the boardstate in a unpleasant way.
This is also why I don't like
Bojuka Bog: I can't use it on response once it's necessary. The
Soul-Guide Lantern is a kinda good grave hate, since you can use it for a card draw, if you don't need the grave hate. 1 card for 2 mana isn't great, but dual use is always useful.