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Not to mention Three Woes...I think it's a viable defense (a Brown defense with 3-4 Kings of Israel and 3-4 other strong Brown ECs should be decent), and then you just add 6 Samarias to a balanced 50 card deck. You can probably run a little lighter on EE since the Samarias will do some work, but again I don't think you can always count on Gates.
With Gates itself, King Ahab and Foreign Exile, that's three chances to get Gates early. Those aren't bad odds, especially if the deck is not entirely based around Gates, and has some other battle winners included as well.