Edison 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.
Rulings
- You cannot Summon Phantom Dragon if you do not have 2 Monster Card Zones that you can make unusable. However, Phantom Dragon can be Set or Special Summoned face-down when you do not have 2 Monster Card Zones to make unusable.
- You cannot activate Phantom Dragon's effect during the Damage Step.
- If a face-down Phantom Dragon is flipped face-up, you will select 2 Monster Card Zones to make unusable. If none can be selected, the next 2 Monster Card Zones to become available will be made unusable.
- Phantom Dragon can be Tribute Summoned if the Tributed monsters will create 2 Monster Card Zones that can be made unusable.
- 2 Phantom Dragons cannot select the same Monster Card Zones to make unusable.
- Once a Monster Card Zone is chosen, you cannot change your choice to a different Monster Card Zone later in the Duel.
- If you have 1 face-up Phantom Dragon while Skill Drain is active, when your opponent Special Summons a monster you can Special Summon another Phantom Dragon into one of the Monster Card Zones that was made unusable by the negated Phantom Dragon.
- If you take control of your opponent's Phantom Dragon, you will select 2 Monster Card Zones on your side of the field to make unusable. If you do not have any available, the next 2 Monster Card Zones to become available will be made unusable.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.