yes,it can destroy all monsters on your opponents side of the field.But if you have good cards in your hand,just wait till you get one you won't need.(You have to sacrifice 1 card to activate it).
Horus the Black Flame Dragon LV6 will not be affected by the effect of Lightning Vortex or Gravekeeper's Servant.
For breaker they can, but not for dark hole or lightning vortex, because those two do not 'target'.
'Scapegoats' is the spell card, and 'Sheep Tokens' are what it summons.Token monsters are treated as monster cards in almost every way. They can be destroyed in the same way, with cards like Lightning Vortex or Smashing Ground.
Yes. Lord of D. only protects Dragons from effects that target. Lightning Vortex does not target.
No, you can't satisfy both costs with a single payment like that. Lightning Vortex has a cost of discarding one card, Captain Gold has a cost of discarding himself. In the same way you could not tribute one monster as both the cost of Enemy Controller and for a tribute summon, you cannot have Captain Gold count as paying the cost for his own effect when he's discarded as the cost for something else.
Dark World Monsters have to be discarded 'by an effect' of a card. If you discard it as a cost, like that for Lightning Vortex, this will not trigger the Dark World card, and you will not get its effect.
fissure, smashing ground, lightning vortex,
Yes, there is the normal spell card 'Lightning Vortex'. The only difference between that and Raigeki is that it requires you to discard a card to activate it.
There is nothing in Lightning Vortex's text that says it cannot be negated, either negating the activation or negating the effect.
No, you can have 3 copies.
Yes, basically. The opponent activates a destruction card like Lightning Vortex or Mirror Force, then you chain Prime Material Dragon's effect by sending one card to the graveyard. PMD's resolution will negate and destroy the destruction card, so since it's not resolving, all your cards are safe.
only when a dragon card is active on the playing field.
Horus the Black Flame Dragon LV6 will not be affected by the effect of Lightning Vortex or Gravekeeper's Servant.
Yes, Lightning Vortex destroys monsters, so Stardust Dragon can negate it. It doesn't matter that the number is variable, or that it does not target. To legally activate Lightning Vortex, it must be able to destroy at least one monster on this field, and this same condition is what allows Stardust Dragon to negate it too.
Lightning Vortex is non-targetting so it never really activated 'on' a specific monster, even if it's alone. If your opponent uses Lightning Vortex and you have an XYZ monster, that monster will be destroyed, as per usual, unless that particular XYZ can save itself from destruction with an effect.
For breaker they can, but not for dark hole or lightning vortex, because those two do not 'target'.
Lightning Vortex is not banned in any format. Neither is it limited nor semi-limited.