Advanced format ruling
Nightmare's Steelcage
Card effect (current official text)This card remains on the field for 2 of your opponent's turns. While this card is face-up on the field, no monsters can attack.
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.