I'm talking about Type 4 here, where people almost never have land in play, and often don't have permanents.
I still find that hard to believe even in Type 4. I mean, unless the stack that you are playing off is set up that way, each player should have at least one or two permanents in play at a time. I guess it is possible to have it happen, but I really haven't see it happen quite that often.
Alternatively, what you can do is "Oracle" the text of Blatant Thievary for the purposes of Type 4 (to make it more playable and interesting). That is:
Blatant Thievery
4UUU
Sorcery
For each opponent, gain control of
upto one target permanent that player controls. (This effect doesn’t end at end of turn.)
This lets you pick 0 or 1 target for each player, and allows it to be played even when some players control no permanents.