Hasbro has issued a Cease and Desist order to those operating Cockatrice, an open source program that allows Magic: the Gathering (MtG) to be played online for free.
This move alienates a large portion of the MtG playerbase and is actually against Hasbro's financial interest. Players currently use the program as a means to test product before buying. Without this tool, interest in continued product purchase dies. I have quoted other individuals below:
"Since i don't have a a play group that i can test proxy decks against, without cockatrice I will be forced to either quit playing standard(read as "magic") or buy cards with out knowing if i want them. Seeing that I only have a chance play magic once a week at FNM I would rather just play more tf2 than spend extra money while also doing poorly for a few hours without being able to modify my deck." - knto
"And doesn't Hasbro know that Cockatrice is used mainly for TESTING? There's a GP here n portland in May. I'm going. I needed to PLAYTEST my deck so I could BUY the cards I needed. What now?" - Enizzle
"I also see why their reasoning fails. People will simply spend less time testing, less time innovating, and ultimately less money on paper cards because once they have something that works, they will be resistant to change." - Dechs Kaison
"I use cockatrice to keep up with the game and test out decks prior to a PTQ.
Testing different decks (and then getting the cards in RL offcourse) is out of the question now. So is testing for PTQ's.
So for me, this will be a dramatic drop in PTQ's and sticking to the same deck longer instead of buying new cards. Since I am someone who gets bored by a deck pretty fast, this might actually resolve into playing only pre-releases/sealed and dropping Type 2/Modern all together." - WvA