Are double-faced cards restricted only to certain formats?

Double-faced cards are indeed allowed in any format that permits them. These cards have two distinct faces and can be played on either side, depending on the situation within the game. The important point is that there are no specific restrictions on the use of double-faced cards in general formats; they are not confined to just one format like Commander nor banned in Standard. As such, as long as a format allows the use of a particular card, double-faced cards can be included in decks for that format.

In formats like Commander, Standard, Legacy, and others where these cards are legal, players can strategically utilize the versatility offered by double-faced cards to enhance their gameplay. The lack of limitations in this regard further supports their general utility across multiple formats, making it clear that they are not only relegated to specific circumstances.