Yes, but running Birds is stupid because you simply give your opponent useful cards (his Shocks/Seals) that would otherwise be almost entirely wasted. Why give your opponent extra good cards? They are also pretty bad drawn from the second turn onwards as the deck curves so well that you don`t actually get a chance to drop them. Dust Bowl beats Ports, Tsabo`s Web shouldn`t be too much of a problem (it`s only two lands in your whole deck, and you can just counter it if you really want) but they aren`t essential - in here mainly because you can. I think a couple of Cities are necessary to ease the mana burden, and you can always Harrow them away vs Ports, or Bowl their Ports. Neither of the non-basic lands are essential, but I think they both balance in favour of 'you might as well'.