We dont have any more concrete information to go on at present, but theres certainly plenty of room for speculation
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Box with 20 packets (english version) of "One Piece Card Game - Premium Booster The Best PRB-01" collection
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(A creature with menace can't be blocked except by two or more creatures.) Midnight Mayhem affects only Gremlins you control at the time it resolves, including the Gremlin tokens it creates
Some possible replacement choices include Gastly, Haunter, and Gengar ex if you'd like to reduce the reliance on certain trainer items, like Red Card