The essence of a concealed tool lies in its ability to be inconspicuous in every circumstances.
Ability / Effect
[Equip Cost] [Pay 1 gauge] All 《Oni Assassin》 monsters on your field get power+1000! When your monsters enters the field by [Ambush], choose a monster on your opponent's field, and you may pay 1 gauge. If you do, destroy that card. This ability only activates once per turn.