Advanced format ruling
Atomic Firefly
Card effect (current official text)When this face-up card on the field attacks or is attacked and it is destroyed as a result of battle, the player who destroyed it takes 1000 points of damage.
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.