[REQUIREMENT] Send the top card of your Deck to the Graveyard.
[EFFECT] 1 face-up Level 7 or higher monster on your opponent's field loses 400 ATK until the end of this turn. Then, it loses additional [number of Spellcaster Type monsters in your Graveyard] x 100 ATK until the end of this turn, if you have "Sevens Road Magician" face-up on your field.