Advanced format ruling
Berserk Dragon
Card effect (current official text)Cannot be Normal Summoned/Set. Must be Special Summoned with "A Deal with Dark Ruler" and cannot be Special Summoned by other ways. This card can attack all monsters your opponent controls once each. During each of your End Phases, this card loses 500 ATK.
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.