MArcomage

It looks quite peaceful. I like the concept of non-agression cards like these.
However... In current wording it might aswell summon Tyran's pride. It gives Tower & Wall, but 20 attack too.

This is a small thing, but I think the first word should be changed to Bricklayers' or Bricklayer. I keep reading it as "brick slayer" rather than "bricks layer"

How about a change in how it effects resources? Instead of setting everything to twenty, transmute all resources of both players into bricks (perhaps with some percent loss for conversion). That way, at least on the first couple rounds, no cards drawn that use other resources can be used. Although the nonliving set could be a problem. Probably would depend on which is easier to code.