Dora of Fate
You can only activate this card during your opponent's turn. Select 1 face-up monster on your opponent's side of the field. When you Normal Summon a monster that is 1 Level lower than the selected monster during your next turn, inflict damage to your opponent's Life Points equal to the Level of the selected monster x 500 points.
Most of our single cards are second-hand, carefully checked, but some can also come directly from recent openings.