Here's a gem from Matt Tabak's tumblr:

Currently, unless I'm wrong, the rules allow a player to replace a card that got damaged or lost with another copy of that card. Can a player tear up his super-pimp Arabian Nights mountain to replace it with another one and dodge City in a Bottle? - subbak

I would be very curious to see how the judge handled such a case. I’m betting we’ll never know.

http://tabakrules.tumblr.com/post/49870189975/currently-unless-im-wrong-the-rules-allow-a-player

Edited Toby Hazes (May 9, 2013 10:24:33 AM)

I reopened this thread since policy now has a firm answer for this. Only cards originally printed in Arabian Nights would get destroyed and it would also affect reprints in future sets. Reclosing. :)