Advanced format ruling
Ally of Justice Catastor
Card effect (current official text)1 Tuner + 1+ non-Tuner monsters
At the start of the Damage Step, if this card battles a face-up non-DARK monster: Destroy that monster.
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.