Freddy Krueger, Formalwear

Deathtouch
When Freddy Krueger, Formalwear enters the
battlefield, look at the top four cards of target
opponent's library, exile one of them face down,
then put the rest on the bottom of that library in a
random order. You may cast that card for as long as
it remains exiled, and mana of any type can be
spent to cast that spell.