Terrek's Perpetual Mist

When this card enters the battlefield, return
target creature to its owner's hand. Search
your library and/or graveyard for a card
named Terrek, the Adversary, reveal it,
and add it to your hand. If you searched
your library in this way, shuffle it.
When a creature your opponent controls with
power 4 or more declares an attack,
you may pay {3}, and return that monster to its
owner's hand.