http://www.channelfireball.com/articles/the-top-5-legacy-decks/

Eldrazi is good for two reasons: The first is that Chalice of the Void is one of the best cards in Legacy, hands down. This deck not only gets to play Chalice of the Void but gets to play it in a shell that’s aggressive enough to kill the opponent before they can start to play through it.
The other reason is that Eldrazi kind of gets around cards that are traditionally fairly strong in Legacy. Lightning Bolt doesn’t do much against this deck. Force of Will is weak against Cavern of Souls. Counterbalance is a joke.
This deck does suffer from some of the same problems that have traditionally plagued archetypes of this nature. Chalice of the Void isn’t good against every deck. Eldrazi doesn’t have a lot of interaction against certain cards or combos. The deck plays a lot of lands and thus is prone to flooding out. Still, despite these issues, this is still one of the best decks in Legacy and a deck to have on your radar. One of the reasons I think Lands is a good choice for GP Columbus is specifically because Lands has a great matchup against the tentacled beasts.