Feywild Riddleseeker

Flying
When Feywild Riddleseeker enters the battlefield,
look at the top four cards of target opponent's
library and exile one of them face down. You
may look at and cast that card for as long as it
remains exiled, and you may spend mana as
though it were mana of any type to cast that
spell. Then that player may scry 3.
"I grow tired of asking the questions."