Beel, Sovereign of Pestilence

Infect
When Beel, Sovereign of Pestilence attacks you
may look at the top three cards of defending
player's library. Choose one and exile it face
down, put one card on the top and the other on
the bottom of their library. You may play the
exiled card for as long as it is exiled and pay mana
of any colour.
If Beel, Sovereign of Pestilence leaves the battlefield exile it instead.