During the coverage for Worlds 2007, Brian David-Marshall said of Doran, the Siege Tower that he's "Phyrexian Negator, except his drawback is awkward mana." Paying BGW for an effective 5/5 has turned out to be more than halfway decent, and Doran has been a consistent player in decks from both the recent Lorwyn-Shadowmoor Block Constructed PTQ season leading to PT Berlin 2008 and the preceding Extended PTQ season leading to PT Hollywood.
With that in mind, consider this lineup:
That certainly looks like three-fifths of a cycle, doesn't it?
Each of these cards is pretty decent for its cost, and any of them with Green in the cost stand a good chance of hitting play by turn two courtesy of a Birds of Paradise. I'd say they're all Constructed playable, although the final decision on that will, of course, have to wait on the whole set and the context of Tenth-Lorwyn-Alara Standard as a whole. At the moment, I'll call out the War Monk as the least interesting of the set, as it's not in a particularly aggressive color combination and thus, even with Lifelink, a 3/4 is pretty vanilla. The Thrinax will fit will in the new style of aggro deck championed during the first half of Lorwyn-Shadowmoor's tenure, where aggro decks make their way around removal by just making more and more guys. In this case, a 3/3 that explodes into a bunch of little dudes makes for a multivalent threat that can potentially be too much for a control deck. Finally, the Thoctar looks like a clear choice for Extended Zoo builds, as a straight-up 5/4 for three mana is gigantic early pressure, especially when you get to bring that monster in as the top of your very, very low curve.
Also, the art and the flavor text on the Thoctar are excellent. That's a world painted in four lines and a picture.