Underhanded Means, Piercing Pins (R)
1
[Counter] For this turn, a monster on your opponent's field gets power-4000, defense-4000 and critical-1! When this face down card is put from the soul of an 《Oni Assassin》 on the field into the drop zone, for this turn, a monster on your opponent's field gets power-10000 and defense-10000!