I feel like people here may be missing the point. The headline is poorly-worded.
The problem is not that they are printing too many duplicates of a card set, and lowering the price. The problem is that they are making too many card sets!
Their MO here lately has been to push some wild new exciting Universes Beyond set, like Final Fantasy, or Doctor Who, or Lord of the Rings, or whatever. They hype this thing up, it comes out to big fanfare, and then it's immediately on to the next one in the next quarter.
They are pumping these out as fast as possible, and it's pissing everybody off. Steamers are sick of it. Players are sick of it. Investors are sick of it. Tolarian Community College has been very vocal about how this shit has been ruining the game and diluting the game into a random soup of somebody else's lore. Their own teams have a hard time balancing the game because of the dizzying pace, and there's been so many cases of standard being left with some broken card fucking up the format for months.
This lawsuit is a good thing.