Can I use this [Activate: Main] effect to rest this Character if my opponent has no Characters with a cost 2 or less?

[P-008_p2] - Yamato (One Piece Promotion Cards: CS 2023 Celebration Pack) - One Piece Card Game

[Activate:Main] You may rest this Character: Rest 1 of your opponent's Characters with a cost of 2 or less.

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