Hansen, Raven's Eye

When Hansen, Raven's Eye enters the battlefield, surveil X.
At the start of your precombat main phase,
choose a instant or sorcery card in your graveyard.
You may cast that card this turn. If it is cast,
exile it instead of putting it into the graveyard.
When a spell is exiled this way, you may pay {x}. If you do, surveil {x}.