Cost reduced from 60b to 45b.
This may not look like it, but it's actually a nerf to Unliving decks. Generally, one included this in a deck to discard it and then play
Reuse the rubble to gain 20 tower and 30 wall. Now, this method only grants 15 tower and 23 wall. Still effective, of course, but not as.
The real question, I suppose, is whether 45 bricks makes this something that's more likely to be played for its actual effects by someone who gained it from a Dragon egg or Illusion effect.