No. The text on Exodia's card is not an actual effect. It's simply there to state what the win condition is. You may not respond to this win condition because it has no spell speed and does not use the chain. It is simply a condition, and thus your opponent automatically wins.
Assuming that the effect of "The Fabled Unicore" is active (therefore, assuming that you and your opponent have the same number of cards in your hands), both the monster effect that was activated and Doomcaliber Knight will be destroyed.
A Yu-Gi-Oh TCG card that reads as follows:Doomcaliber KnightAttrib: DarkType: Fiend/EffectLevel:4Atk: 1900Def: 1800This card cannot be Special Summoned. When an Effect Monster's effect is activated, you must Tribute this card. Negate that effect's activation, and destroy the monster.At this time this card is only available by either taking a high place in the Shonen Jump Championship tournaments, or by getting it randomly in the 5Ds Turbo Pack only available in Europe.
vomiting ogerett
If an effect is a Quick Effect, it will imply so in the text. For example if it has an effect that chains to an opponent's card or responds to an opponent's action (Prime Material Dragon, Doomcaliber Knight, Dark Paladin's negation effect, etc) then the only way these effects can work, is if they are Quick. It would be impossible for these effects to work correctly if they were Ignition Effects. When the card has no text to say it's a responsive effect like the above, and is not a Triggered effect, then by default it is an Ignition Effect. Plasma Vice's destruction effect is not triggered, nor does it respond to any game action, therefore it is an Ignition Effect.
yes
Once every turn
No, it is an Ignition Effect and can only be used in your turn.
geminis must be summoned a second time to get the effect while effect monsters only need one summon
No. It is an Ignition Effect, meaning you may only activate Snipe Hunter's effect during your turn.
Yes.
Magic planter
Standby phase is in a yugioh duel after draw phase,you could use card effect at standby phase.