Now I'm playing a deck with this card and Plan of salvation, and I feel that Plan of salvation is much stronger than Architectural improvement. Plan of Salvation has high chance to get Northern fortress, Border fortress, Fortified castle - only Pyramids can't be summoned by Plan of salvation.
On the other hand, Plan of salvation is cheaper (zero cost vs. 25 bricks), can give you more bricks (25 vs. 15 pure), can summon rares like Dragon golem or Great Wall of China.
Maybe it should cost 20b and give 45 bricks? Or... should "no keywords" filter be removed from this aswell?
But before you say something, I must say: I'm not sure if Architectural improvement needs a buff or Plan of salvation needs a nerf...