Quote Originally Posted by Mysticp View Post
SE is not releasing the copyright. They are selling you an item. If I buy magic cards I can sell those magic cards to anyone I want. I don't own the copyright for Magic. I just own an item I can sell.
They aren't selling you an item if they don't release the copy right to that item. When you buy something from the mog store you are buying a license to use that item, not an actual thing that you own. Both the in game EULA and EULA for the mog store make that very clear. When you buy a pack of MtG cards, they release the copyright of that item to you to do whatever you want with, in so far as you don't infringe upon the name MtG in your resale or distribution or use.
Copyright Release is when a copyright holder releases something to be used commercially while still retaining the rights to that something. It doesn't mean letting go of all Copyright associated with that product.