How about this:
Card Name: Limited Resources
Cost: W
Type: Enchantment
Rules Text: When Limited Resources comes into play, each player
chooses five lands he or she controls and sacrifices
the rest.
Players can’t play lands if there are ten or more lands
in play.
Set/Rarity: Exodus rare
Is hard locking a game at 0 lands for your opponent worthwhile?
It's not quite a hard lock, with moxen, and other ways of getting lands into play. The problem is you have to get this down fast and get 10 lands down just as fast. Which is very hard without going 3+ colors which screws with consistancing and eventually everything just falls apart and you end up playing land-D with limited resources.
I think weathered wayfarer could be abused more. You can search for wastes, strip, acedemy, etc.