Hey Mark! I was wondering, can you tap glacial chasm for mana? It doesn't have a mana ability printed on the card, and most non-basics do, so I didn't think you could, but it was under debate. Do all lands tap for mana even if it's not printed? Or is that just the basics?

If the land doesn’t say it does, it doesn’t. As a design rule, we try to make all lands tap or get access to mana, but it’s a rule we occasionally break and broke much more often in the past.

Why do you never print any interesting lands anymore? Things with effects like Glacial Chasm, Maze of Ith, Volrath's Stronghold, Karakas, or Horizon Canopy? Unique effects like those on lands, especially ones which don't produce mana, are one of the most interesting deck-building aspects. It allows another entire avenue of resource management to be explored, trading your ability to make land-drops for an effect, and there seems to be no support for those kind of effects at all anymore.

We decided long ago that lands needed to produce mana (or go get you mana) as we want to keep a clear identity between lands and mana. Also, we tend to limit how many other abilities lands have because it’s very hard to track what your opponent’s lands can do.