Trait

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Activation
Energy

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Effect

If <Robin Mask> is on your field, reduce this card's AP cost by 1 while in your hand.
Choose up to one character with 5000 or less BP on your opponent's front line and sideline it. Choose up to one <Robin Mask> on your field. It gains "If your opponent sidelines this character with a [Special Trigger] ability, they add the card with the [Special Trigger] ability to their hand instead" until the end of the turn.

Trigger

[SPECIAL] Choose one character on your opponent's front line and sideline it.