This is mainly used by the Dark Marique, which was used to kill Marique Ishtar's father and the doctor of the hospital room that was treating the Lisid, and was blocked by this and other factors
The card has the ability to exile itself from the graveyard in order to filter through the top three cards of its controller's deck and put one of them into their hand
If Castel detached both materials, it could target a card on the field and shuffle them into the deck, a way to remove a monster without destroying it
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THE SIDE-LOAD RINGLESS BINDER (PORTFOLIO STYLE) Source: Amazon This is where modern consensus has largely landed
Then, all of your opponents Monsters lose 500 attack and defense points for each Monster banished this way