Code Hack (MZMI-EN039) - Maze of Millennia 1st Edition

Cyberse Link Monsters you control cannot be destroyed by your opponent's card effects. Once per turn, during the Battle Step, if your monster battles an opponent's monster: You can activate this effect; that opponent's monster's ATK becomes 0 until the end of this turn, also for that battle, monsters cannot be destroyed by battle and neither player takes battle damage. That opponent's monster must be face-up on the field to activate and to resolve this effect. When your opponent activates a card or effect during a Damage Step that your "Code Talker" monster is attacking in: You can banish this card from your GY; negate the activation, and if you do, your attacking monster gains 700 ATK.