• Note that "Horus the Black Flame Dragon LV8" has the word "except" in its Summoning conditions, which means that even if Special Summoned properly, you cannot revive it with "Monster Reborn" afterwards if it is destroyed.

• The "you" in "on your side of the field" is the current controller’s field, so as long as "Horus the Black Flame Dragon LV8" is face-up, it is always "face-up on your side of the field".

• The ability of "Horus the Black Flame Dragon LV8" to negate Spell Cards is a Quick effect that must be chained to the activation of the Spell Card. You can activate this effect multiple times in the same chain to negate the activation and effect of several Spell Cards that are activated in the same chain.

• You can chain the effect of "Horus the Black Flame Dragon LV8" to the activation of a Continuous Spell Card, Field Spell Card, or Equip Spell Card and negate it. However, if the Continuous, Field, or Equip Spell Card is already active, you cannot later decide to try and negate its effect with "Horus the Black Flame Dragon LV8". You can only negate it when it is originally activated.

• You can activate the effect of "Horus the Black Flame Dragon LV8" during the Damage Step.

Mentions in Other Rulings

• Clock Tower Prison: Putting a Clock Counter on “Clock Tower Prison” can be chained to. The effect to Special Summon “Destiny Hero - Dreadmaster” can also be chained to. Even though this can be chained to, it cannot be chained to with an effect that negates the activation of a Spell Card, such as..."Horus the Black Flame Dragon LV8" because the "Clock Tower Prison" card has already resolved.

• Fairy Guardian: Spell Cards that are eligible for this card's effect include...Spell Cards negated and destroyed by an opponent's..."Horus the Black Flame Dragon LV8"...

• Horus the Black Flame Dragon LV6: If you don’t have "Horus the Black Flame Dragon LV8" in your hand or Deck, you cannot send "Horus the Black Flame Dragon LV6" to the Graveyard to activate its effect.

• Horus the Black Flame Dragon LV6: You can activate "Level Up!" and send "Horus the Black Flame Dragon LV6" to the Graveyard to Special Summon "Horus the Black Flame Dragon LV8" because sending 1 monster to the Graveyard is a cost for "Level Up!" and if a card is unaffected by Spell Cards, that only refers to effects, not to costs.

• Horus' Servant: "Horus' Servant" has an effect just like "Lord of D.", but only applicable to "Horus the Black Flame Dragon". "Horus' Servant" will not negate a card effect. All it does is prevent "Horus the Black Flame Dragon" from being selected as a target. If your opponent selects "Horus the Black Flame Dragon" as a target (with "Ring of Destruction", for example), and you chain "Call of the Haunted" to Special Summon "Horus' Servant", then "Horus the Black Flame Dragon" will still be destroyed by "Ring of Destruction" because "Horus' Servant" is being Special Summoned AFTER "Horus the Black Flame Dragon" was selected. The fact that "Ring of Destruction" has not yet resolved does not matter; "Horus the Black Flame Dragon" was selected at the activation of "Ring of Destruction", and "Horus' Servant" is Special Summoned too late to prevent this.

• Horus' Servant: Your opponent cannot activate a Spell Card, Trap Card, or Monster Effect that would select "Horus the Black Flame Dragon" as a target while "Horus' Servant" is in play. "Horus' Servant" does not cause the effect to be negated; he prevents the activation of the effect in the first place.

• Level Modulation: An "LV" monster that normally cannot be Special Summoned except by the method in its text CANNOT be Special Summoned from the Graveyard with "Level Modulation" unless it has been previously Special Summoned by the correct procedure. The "ignore the Summoning conditions" text allows for these monsters to be Special Summoned only after they have been properly Summoned by their own effect. This applies to "Horus the Black Flame Dragon LV8"...