Advanced format ruling
Prideful Roar
Card effect (current official text)During damage calculation, if your monster battles an opponent's monster with a higher ATK: Pay LP equal to the difference in ATK; your monster gains ATK equal to that difference +300, during damage calculation only.
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.