Unicorn is great for getting rid of monsters that can't be destroyed by battle or card effects and spell or trap cards that are causing trouble
Even with Masters sets now in Wal-Mart, Wizards still needs local game stores (probably more than Wizards is showing with some of its recent moves), and dropping the MSRP of Masters sets could help get some local game stores back into the fold that, after the disaster that was Iconic Masters , are currently on the fence about selling Masters sets at all
They also have their stats reversed, with Duke now having good Intellect and Fight, but low Willpower and Agility
Rin: Good luck for both of you
However, the card should be on the field whenever you have the chance
Pitching it to Force of Will, casting it with Up the Beanstalk, or just fetching a Tundra are all great things to do with this