Is there a specific order/action when searching your library? Opposition Agent says:
You control your opponents while they're searching their libraries.
While an opponent is searching their library, they exile each card they find. You may play those cards for as long as they remain exiled, and you may spend mana as though it were mana of any color to cast them.
Are they exiling only the card they are searching for or 1 card at a time till they find it?