You can buy towers at the shop, but you can only build Arcane Towers. Pretty pointless. And its tier 1 you get them.
And the Tiny Town Hall, may just build a main of that race.
I have a sweet wvyern build that is good on maps like Dragonblight or non-rush maps. I have done it 3 games today and won all 3.
I start with altar, burrow, and barracks, 3 on gold. Then start my hero and get about
4-6 more peons on wood. As I tech to t2, I get a shop, another burrow if I haven't and a War Mill. By the time t2 is done, I have 1000 gold or so to get my 2 Bestairies and get my wyverns going.
The only con is if I get rushed or I don't get enough food to start wvyerns. By the time I have the bestaires up, I should have 2 Wvyerns comin.