Every creature-based sacrifice outlet stops working
I hear Yugioh did the same thing, which really messed up the balance early on
Commander, which is reminiscent of a former game format called Elder Dragon Highlander, or EDH, is a format where players build a 100 card singleton deck, built from the card colors contained within the color identity of the commander of the deck, which must be a legendary creature or one of the special Commander planeswalkers created by Wizards of the Coast
There are a lot of fun cards here
Almost always, in nearly every format, some players try to make Mill work even if it's not necessarily competitively viable
He also said that eBay was the obvious choice when it came to deciding where to list his rare Pikachu Illustrator card