Yes it can. Sangan is a triggered effect, Stardust Dragon Assault Mode can chain to and negate it.
Copycat has an effect that Triggers when it is summoned. Stardust Dragon Assault Mode can chain to this trigger to negate it, and destroy Copycat.
Monster Quick Effects that can negate things are ruled that they can be activated in the Damage Step. That includes Gladiator Beast Heraklinos, Horus the Black Flame Dragon Lv8, Light and Darkness Dragon, Stardust Dragon, and Stardust Dragon Assault Mode.That means any appropriate ones from the above are able to negate Honest.
no it does not because stardust only stops effects that "destroy" a card(s) "remove" is different and therefore stardust cannot negate the effect Also you can get a card called divine wrath in a pack and negate it. - [Kaizoku] -Stardust Dragon/Assault mode can, Stardust Dragon can only negate destruction.
Stardust Dragon has a triggered effect that special summons it from the graveyard on the turn that it negated an opponent's effect. Forbidden Graveyard will negate this trigger, Stardust Dragon will not be summoned.
Yes. Gandora's Ignition Effect is a destruction effect, so you can chain Stardust Dragon to it, to negate and destroy it.
Because Dark End Dragon does not 'destroy' anything, Stardust Dragon is unable to negate it.
I'm assuming this is a TV show question. And the answer is Yes.
Yes. Most negation effects like Light and Darkness Dragon, and Stardust Dragon, can be used in the Damage Step, which is where Newdoria triggers. Stardust Dragon can indeed be used against Newdoria's activation.
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.
No, Power Tool Dragon has no such negation effect.
Yes, if a card effect activating from the Graveyard will destroy a monster, Spell, or Trap card "Stardust Dragon" can be activated to negate the effect. Even though "Stardust Dragon" states that it destroys and negates cards, it can still negate an effect resolving in the Graveyard; the card in the Graveyard simply will not/ cannot be destroyed.
Chaos Sorcerer doesn't destroy, so you can banish Stardust.