You activate it if it meets its activation condition, which is to destroy an opponent's monster by battle that turn. So if the opponent attacked it, and you boosted the ATK of Jurrac Dino, making it destroy the attacker, then the condition is met.
No, it is an Ignition Effect and can only be used in your turn.
there is no such card with an effect like that. you could be referring to parasitic parasite, which is special summoned to their side of the field when they draw it and they take 1000 damage.
No, you can't.
Depends what for. You could tribute it for a spell speed 2 or 3 effect such as Enemy Controller, but not for an Ignition Effect.
Once every turn
No. It is an Ignition Effect, meaning you may only activate Snipe Hunter's effect during your turn.
Yes. Jurrac Herra's effect is a Trigger, and can be chained to and negated by monster effect negation like Gladiator Beast War Chariot.
No, it is an Ignition Effect and can only be used in your turn.
there is no such card with an effect like that. you could be referring to parasitic parasite, which is special summoned to their side of the field when they draw it and they take 1000 damage.
No, you can't.
Depends what for. You could tribute it for a spell speed 2 or 3 effect such as Enemy Controller, but not for an Ignition Effect.
vomiting ogerett
yes
Once every turn
No, Alector has no effects that can be used in the opponent's turn. His summon effect is something that can only be done in your main phases, and his negation effect is an Ignition Effect so again, can only be done in your turn.
yes
Of course not Why would someone chain a card that ends the opponents turn with another one that has the same effect