That the spaces you can not build on are in a random position so that every game you have to think about where to place what card instead of saying certain cards go in certain positions
Right now the terrain tile positions are fixed, but they keep getting shuffled around. Had planned for more terrain tiles as well. But yeah, position is something to vary as well. Have to see about keeping it balanced though. It's a fair suggestion. Thanks!
Just FYI, I made the terrain layout randomized, and I'd say it's working well. Although there a few imbalanced combos, it seems to be fun overall. It's live on the current build, with quite a few more cards and changes. Cheers!