Goat Format · April 2005
What the Goat Format rulings add to, or change from, the rulings above.
If "Skill Drain" is active on the field when "Jinzo" is summoned, and "Royal Decree" is later activated, "Royal Decree" will negate "Skill Drain". Since "Skill Drain" is no longer negating "Jinzo's" effect, "Jinzo" will negate both "Royal Decree" and "Skill Drain."
Edison Format · March 2010
What the Edison Format rulings add to, or change from, the rulings above.
Trap Effects do not leave the field even if the physical card leaves the field. For example: If "Jar of Greed" is activated, and "Mystical Space Typhoon" is chained, targeting that Jar of Greed, while this card's effect is applying, "Jar of Greed" is still negated, even though the card is in the GY.
[FORUM] "Royal Decree" must be face-up to negate Trap Card effects. Example: "Royal Decree" is face-up on the field and an attack is declared. "Mirror Force" is activated and "Mystical Space Typhoon" is chained, targeting "Royal Decree". "Mystical Space Typhoon" destroys "Royal Decree". "Mirror Force" than resolves and destroys all Attack Position monsters your opponent controls. Since "Royal Decree" is no longer face-up when "Mirror Force" resolves, it will not negate the effect of "Mirror Force".