You dont have to worry as much about mana fixing, so the mana rocks dont need to tap for multiple colors
What's more, it happens to be capable of blanking smaller creatures (and any card that would cause your opponent to search his or her library, for that matter)
It was the largest deck ever played with 2,222 cards
This wide availability means that even rare English cards can often be found for sale in many places, and completing English sets or finding specific singles is relatively convenient
It's the same 200-odd cards that everyone else can access and, more importantly, only one or two of the rare ones are required for you to build a highly competitive deck around - after less than a week of checking in daily, I had enough for at least one, and probably with a bit of targeted play two or three, of the main competitive decks already