If you could reliably cast this off of a Mountain, a Forest, and a Swamp, that would be great, but that's not an option
Think High Tide, Darkness, and similar levels of absolute flavor over pie function
Over the past couple of years, gaining control of permanents has gone from being on Auras to being on spells and creatures like Agent of Treachery
One of the biggest complaints about Masters sets is how much they cost, and shaving a few dollars off the MSRP (especially since the product is selling so far below MSRP already) would send a strong message that Wizards hears players' concerns about pricing and is willing to take action
These were a correction to the intended mechanics, rather than outright changing what the card does for balance purposes
There was an occasion where members of the Magic team working on the setmyself includedflew out to Japan to run a playtest with SQUARE ENIX and show them the cards