Advanced format ruling
Phantom Dragon
Card effect (current official text)When your opponent Special Summons a monster (except during the Damage Step): You can Special Summon this card from your hand. 2 of your Monster Card Zones cannot be used.
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.