Changes

*When a monster's attack is negated by "[[Magic Cylinder]]", the monster is not treated as having declared an attack, so the effect of "[[Red Dragon Archfiend]]" will still destroy it during the End Phase.<ref>[http://www.db.yugioh-card.com/yugiohdb/faq_search.action?ope=5==Q&fidA Rulings==7398&request_locale=ja Konami OCG Card Database]: With "Red Dragon Archfiend", is a monster still destroyed when its attack is negated? </ref>

*When {{Ruling| Q = "[[Red Dragon Archfiend]]" attacks and destroys a Defense "[[Red Sprinter]]" are face-up in my Monster Zone, in Attack Position . If my "[[Giant RatRed Sprinter]]"attacks, but the efect attack is negated by the effect of my opponent's "[[Magic Cylinder]]", will "[[Red Sprinter]]" be destroyed by the effect of "[[Red Dragon Archfiend]]" destroys during the End Phase?| A = In this scenario, the attack by "[[Giant RatRed Sprinter]]", so was negated by the effect of "[[Giant RatMagic Cylinder]]" , but since an attack was declared, it is not activateda monster on your field that did not declare an attack.<ref>In this case, the effect of "[[Red Dragon Archfiend]]" will activate during the End Phase, but "[[http://wwwRed Sprinter]]" is not destroyed.db.yugioh-card.com/yugiohdb/faq_search.action?ope| cite =5&fid7398}} {{Ruling| Q =7399&request_locale=ja Konami OCG Card Database]: When "Red Dragon Archfiend" destroys a Defense Position monster by battle, is the monster treated as being destroyed by battle?</ref>| A = When "[[Red Dragon Archfiend]]" attacks and destroys a Defense Position "[[Giant Rat]]", the effect of "[[Red Dragon Archfiend]]" destroys "[[Giant Rat]]", so the effect of "[[Giant Rat]]" is not activated.| cite = 7399}}

* "[[Red Dragon Archfiend]]'s" effect activates after damage calculation in the Damage Step, before the effects of flipped [[Flip Effect Monster]]s or the effects of cards like "[[D.D. Warrior]]" activate. If "[[Red Dragon Archfiend]]" attacks a face-down [[Flip Effect Monster|Flip Effect monster]] and destroys the [[Flip Effect Monster|Flip Effect monster]] with its effect, the [[Flip Effect Monster|Flip Effect monster]]'s Flip Effect activates after it is destroyed.<ref group="Out of Date">The revised [http://www.yugioh-card.com/uk/gameplay/damage.html Damage Step Rules] confirms that "after damage calculation" effects and Flip effects activate at the same time.</ref>