Hull Dismantler Slash (OP03-073) [Pillars of Strength]

[Main] DON!! -1 <em>(You may return the specified number of DON!! cards from your field to your DON!! deck.)</em>: If your Leader has the [Water Seven] type, K.O. up to 1 of your opponent's Characters with a cost of 2 or less.
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[Trigger] Activate this card's [Main] effect.