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It says, "If used by a Luke Hero, convert a human Evil Character to a gold brigade Hero. Cannot be negated by an evil card. If rescue attempt is successful, opponent must draw four cards." So does this card not just help the opponent get through his cards faster? I am under the impression that a player only has to discard cards when it is there turn.
With a hand limit of 16 now, that card might have gained/lost a little power by possibly preventing your opponent from drawing one more card his next turn.