Collectible Card Game Headquarters

The code uses ZONE_ANYWHERE, so the only ones that should be unaffected should be those in exile. And it filters for all card types, including lands. I'll have to test it to be sure, but it should already prevent lands being played.

I'll go ahead and add the can't attack characteristic just to be on the safe side, but it should be unnecessary because the combat phase is skipped. Better safe than sorry, though.