Kess of the Pact

When Kess of the Pact enters the battlefield,
exile the top card of your library. You may
put that card into your hand unless it has the
same name as another card exiled this way.
Repeat this process until you put a card into
your hand, or until you exile two cards with
the same name.
{2}, {t}: Choose an instant or sorcery card in
your graveyard. You may cast it this turn.