The effect that increases the ATK and DEF of all face-up Zombie-Type monsters on the field by 200 is a Trigger Effect that activates on the field. (This effect does not target. It always activates if "Castle of Dark Illusions" is flipped face-up. It also activates during the Damage Step.)[1]
This effect is applied to all face-up Zombie-Type monsters in both players' Monster Zones at the time the effect is resolved.[1]
The effect that increases the ATK and DEF of all face-up Zombie-Type monsters on the field by 200 during your Standby Phase is a Trigger Effect that activates on the field. (This effect does not target. It always activates once during each of your Standby Phases until your 4th Standby Phase after the Trigger Effect of "Castle of Dark Illusions" was activated and applied when flipped face-up.)[1]
This effect is applied to all face-up Zombie-Type monsters in both players' Monster Zones at the time the effect is resolved.[1]