What are spells or abilities that instruct a player to exchange cards in different zones required to consider?

The requirement that all cards must be controlled by the same player is essential in scenarios where spells or abilities instruct a player to exchange cards in different zones. This ensures that the player has the authority to manipulate the cards involved in the exchange, as only the controlling player can dictate what happens to their own cards.

In situations where cards are exchanged between different zones, the controlling player must have ownership of those cards to successfully fulfill the action of exchange. If the cards belonged to different players, there could be complications regarding permission and the legality of the exchange. Furthermore, card exchanges often occur between cards in a player's hand, library, or graveyard, which necessitates a single player having total control over the cards involved.

This understanding aligns with the rules that govern card interactions and clarifies that the specified exchange between zones cannot occur unless the same player controls all cards involved.