Advanced format ruling
Max Warrior
Card effect (current official text)If this card attacks an opponent's monster, this card gains 400 ATK during the Damage Step only. If this card destroys an opponent's monster by battle, until your next Standby Phase: this card becomes Level 2 and its original ATK and DEF are halved.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.