Cracking Dragon (COTD-EN014) [Code of the Duelist]

Cannot be destroyed by battle with a monster with equal or lower Level. When your opponent Normal or Special Summons exactly 1 monster (and no other monsters are Summoned) while this monster is on the field: You can make that monster lose ATK equal to its Level x 200 (until the end of this turn), and if you do, inflict damage to your opponent equal to the ATK lost by this effect.