You'll find the full developer post over at the official website, but if you're looking for the short version, here's a couple of choice quotes: "To affirm what we talked about back in September, a smarter system that provides what we have dubbed "duplicate protection" is still our top contender, and the current design space we're working with." "Okay, so we have the goals we want to accomplish, we have the problem space, and we have a system that will help us reach these goals
This card is traditional foil 20% of the time
Do foil proxies shuffle worse
This is likely why the three most popular Mono Blue commanders are ones that provide mana advantage: Urza, Lord High Artificer turns all your artifacts into mana rocks, Orvar, the All-Form lets you easily make copies of your lands and/or mana rocks, and Minn, Wily Illusionist ramps out permanents (including lands) whenever your illusions die
That said, Satoru Umezawa is a new card that grants every card in your hand ninjutsu, and that could lead to some very silly stuff when combined with thirteen-mana Eldrazi in formats like Modern
