hey, dude, your "thing" no longer beating a wall!
Except I guess the SPRK would not delete metals, instead it would spark them. Perhaps dead LIFE would work better, like I did for the text on my wall.
I think you should make a new version that can expand properly when already surrounded by materials. CRAY with a ctype of SPRK would do the trick, replacing materials with nothing at all.
So, I put this in a bomb analyzer and couldn't get a reading from it.... mainly because it destroyed the whole thing.
Congratulations SLicK! I added your device to my Hall of Fame! It hasn't even been 24 hours since I started my challenge, and you won! Excellent work!