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[38] During Yuya's Duel against Crow while she was on her way to the underground with Moon Shadow and Riley her bracelet began to glow, causing her to wonder what was happening

He took pleasure in torturing his opponents

Not only is this effective at mitigating any battle damage you might have taken from combat (though that's also hard since Ni-Ni takes no battle damage and reflects damage back), but it blocks any combos your opponent might have been planning with their monster for their turn

As far as strategy goes, this is a great card to get late in the game or not attach any energy cards to until you want it to be your active Pokemon