Advanced format ruling
Castle of Dark Illusions
Card effect (current official text)FLIP: All Zombie-Type monsters gain 200 ATK and DEF. During each of your next 4 Standby Phases, each of those Zombie-Type monsters gains 200 more ATK and DEF. These effects last as long as this card is face-up on the field.
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.