How does this card's [Opponent's Turn] effect work, exactly?
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Official Ruling
This effect gives <Security A. -2> to all of your opponent's Digimon with levels greater than or equal to the total cards in both players' security stacks. For example, if the total cards in both players' security stacks is 6, then all of your opponent's level 6 and higher Digimon will get <Security A. -2>.