Overseer's Globe 
Artifact
If a land would come into play under an opponent's control, instead it comes into play under your control. At end of turn, its owner gains control of it.
In limited, this won't do much. Then again, neither did Life from the Loam.
In constructed, all you need is a sac outlet, and this is looking pretty sweet. Balanced, I'd say, and potentially quite potent.
wait, why did you get rid of the anti sack clause?
as I look at it it's already a 1 sided rootmaze (sort of) that in control decks is amazing since a) they don't get to use lands the turn they play them, and b) you get to use the mana to play all of the fun instants you have. In fact i think if it cost any less it would be quite unfair.
and wasn't this an artifact before?
also I think the wording you would want is more like "if a player would play a land, it comes into play under your control instead, return it to it's owners control at end of turn" since right now they can tap the land in responce to giving it to you.
Thanks for the wording assistance.
Apparently it was an enchantment instead of an artifact to begin with, that was just a mistake.
I dropped the anti-sack clause because it made it pointless.
It kind of seems ambiguous where the lands go after you lose control of them. I'm sure that there is perfectly good rules wording that makes it work how you want, it just kinda sounds funny. I can see noobs saying "But where does it go at end of turn?"
The wording is pretty standard for this type of effect. For example:
Threaten
There's a big difference though, Inertia. With Threaten type effects, the target is already under someone's control when you steal it, so the "until end of turn" clearly means it goes back to whoever controlled it before. With this though, it isn't under anyone's control - it just comes into play under your control, so where will it go afterward? So yeah, jodo has a valid point.
nice observation Jodo. it should now cause the owner of the land to gain control of it at end of turn.