Bark of Dark Ruler

Yu-Gi-Oh Card: Bark of Dark Ruler
Available from these partners:
Bark of Dark Ruler
Type:Normal Trap
Text:You can only activate this card during the Damage Step of a Battle Phase if a Fiend-Type monster on your side of the field battles. Pay Life Points (in multiples of 100 points) to decrease 1 of your opponent's monster's ATK and DEF by the same amount of points until the End Phase of that turn.
Printings: Battle Pack 3: Monster League (BP03-EN191)
Dark Beginnings 2 (DB2-EN132)
Legacy of Darkness (LOD-EN010)
Turbo Pack : Booster 4 (TU04-EN010)