Advanced format ruling
Harpies' Hunting Ground
Card effect (current official text)All Winged Beast monsters gain 200 ATK/DEF. If any "Harpie Lady" or "Harpie Lady Sisters" is Normal or Special Summoned: The player who conducted the Summon targets 1 Spell/Trap on the field; that player destroys that target.
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.