Adela Windcatcher, Broken

Deathtouch
When Adela Windcatcher, Broken 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. For as long as that card remains exiled, you may look at it, you may cast it, and you may spend mana as though it were mana of any type to cast it.

All she knew was sickness.