Dimension Sphinx (MVP1-EN023)

Activate this card by targeting 1 face-up Attack Position monster you control. Once per battle, during the Battle Step, if it is attacked by an opponent's monster with higher ATK: You can inflict damage to your opponent equal to the difference between the attacking monster's ATK and the targeted monster's. If the targeted monster leaves the field, destroy this card.

trap / Continuous, Yu-Gi-Oh! The Dark Side of Dimensions Movie Pack