Cordelia, Sidhedron Hero

Flash
Flying
Whenever an opponent scries, surveils, or
searches their library, exile the top card of
their library. You may play the exiled cards
for as long as they remain exiled, and mana
of any type may be spent to cast them.
{w/u}, Discard a card: Return Cordelia,
Sidhedron Hero to its owner's hand.