Advanced format ruling
Gryphon's Feather Duster
Card effect (current official text)Destroy all Spell and Trap Cards on your side of the field. Increase your Life Points by the number of destroyed cards x 500 points.
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.