Dora of Fate

An example of this card's effect in action would be: On your opponent's turn, you select a Level 4 monster on your opponent's side of the field (though you can choose any Level, really). On your next turn, you Normal Summon a monster whose 1 Level lower than that one, a 3-Star monster. Your opponent is hit with 2000 points of damage, equal to the level of their selected monster (4) times 500.