Edison 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.
Rulings
- The effect to change the Level and halve the ATK/DEF of this card is a Trigger Effect that activates at the end of the Damage Step.
- If you use the effect of "Assault Armor" to let "Max Warrior" attack twice and destroy two monsters, its Level will be 2 and its original ATK/DEF will be ¼ of their printed value.
- The halved ATK/DEF is considered the original ATK/DEF while "Max Warrior’s" effect is being applied.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.