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

[Main] DON!! -1 (You may return the specified number of DON!! cards from your field to your DON!! deck.): 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.
[Trigger] Activate this card's [Main] effect.