Horus the Black Flame Dragon LV8 (Purple) [DL17-EN002] Rare Dark Revelation Volume 3 You can only use this

You can only use this effect of "Invocation" once per turn

You can only activate 1 "Spellbook of Secrets" per turn

you can negate the activation of a Spell/Trap Card

Set: Duelist League Promo Card type: Effect Monster Rarity: Rare Attack: 2400 Defense: 1000 When this card is Tribute Summoned: Target 1 card on the field

but it cannot attack your opponent directly

Horus the Black Flame Dragon LV8 (Purple) [DL17-EN002] Rare Dark Revelation Volume 3 You can only use thisSet: Duelist League Promo Card type: Effect Monster Rarity: Rare Attack: 3000 Defense: 1800 This card cannot be Normal Summoned Set. Must be Special Summoned by "Horus the Black Flame Dragon LV6" and cannot be Special Summoned by other ways. During either player's turn, when a Spell Card is activated: You can negate the activation, and if you do, destroy it. You must control this face up card to activate and resolve this effect.