Advanced format ruling
Zero Gardna
Card effect (current official text)You can Tribute this card to activate its effect. If you do, monsters you control cannot be destroyed by battle, and you take no Battle Damage, during this turn. This effect can be activated during either player's turn.
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.