Advanced format ruling
Firewall
Card effect (current official text)When your opponent declares a direct attack, you can negate that monster's attack by removing from play 1 Pyro-Type monster in your Graveyard. Pay 500 Life Points during each of your Standby Phases. If you do not, destroy this card.
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.