Its a really simple ability, but being able to consistently play a three-mana card on turn two is hard to beat in so many different formats
Its a Blue Sorcery that reads, Each opponent exiles cards from the top of their library until that player has exiled cards with total mana value 20 or more. Its only not as good in Commander because people tend to have higher mana curves, but itll still make everyone other than you sad
The unique Ability on Unknown, called HAND, states that once during your turn, before you attack, if Unknown is in your active spot and you have 35 or more cards in hand, you can use this ability to just win the game
Then you may sacrifice this land
With the exception of one store in Japan I had read about, I saw no evidence of retailers placing limits on products, and didnt feel I could count on the set being available by the time I travelled there on release day