Mithril golem, Common, 4b
Unliving. Runic.
Brick production: x2
wall: +5
Wow. I would certainly use this card in my Unliving deck. 4x bricks production when triggering the token effect would make it even easier than it already is to keep up with the costs of the Uncommons.
Even outside of the Unliving deck, this could give 7 wall and 2 tower due to Runic for (factoring in the 2x production with the basic 3 Quarry) only 1 brick before standard production, and at worst 5 wall for the effective 1 brick is comparatively good as well.
All in all, this has me thinking it's just a bit too good as it stands. I'm not sure what to change about it, however. Removing Unliving might balance it out so you can't come away with 4x bricks, but you can't make a golem and not have it be Unliving...