Does this card's [Your Turn] effect give it the [Three Musketeers] trait during my turn even when it's in an area other than the battle area?
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No, it doesn't. This card's [Your Turn] effect only activates while this card is in the battle area during your turn. It can't be referenced as a [Three Musketeers] trait card when it's in an area other than the battle area during your turn.
Source: EX7-010 Deputymon