Alexandrian Angel

Flying, Vigilance, Lifelink.
When Alexandrian Angel comes into play look at target player's library, choose four cards and exile
them. Once during your turn, you may play one
of these exiled cards. Spend mana of any
combination of colors to pay its casting cost.
When Alexandrian Angel leaves play, return the
exiled cards to that player's library. That player shuffles their library.