NeoArkadiaドラゴニック・ギアス Dragonic Geas
Normal Spell Card
[REQUIREMENT] You can activate this by sending 1 monster (Level 7 or higher/Dragon-Type) from the hand to the Graveyard.
[EFFECT] Choose 1 face-up Defense Position monster your opponent controls and destroy it. Then, all face-up monsters your opponent controls lose 2500 ATK until the end of the turn.
Source