no, if you read it, it says that only you can.
Yes, it is a Continuous Trap card with a Quick Effect. You can activate the card in any phase of the opponent's turn, and you can activate the effect of the card in any phase of the opponent's turn also.
No, it is an Ignition Effect and can only be activated on your own turns.
Stardust Phantom's first effect is a Trigger, and will activate whenever the condition is met. That means it can activate in your turn or your opponent's turn.Stardust Phantom's second effect is an Ignition Effect and can only be activated in your own turns. The protective effect it applies to a Synchro Monster will work like a continuous effect, it can be protected once per turn in either player's turn.
Yes, it remains on the field and can attack as long as your opponent does not activate another effect.
No, it is an Ignition Effect so can only be used in your own turns.
Yes, it is a Continuous Trap card with a Quick Effect. You can activate the card in any phase of the opponent's turn, and you can activate the effect of the card in any phase of the opponent's turn also.
No, it is an Ignition Effect and can only be activated on your own turns.
Since DD Sprite can only be summoned during your own turn, its trigger will activate in the opponent's Standby Phase.
Stardust Phantom's first effect is a Trigger, and will activate whenever the condition is met. That means it can activate in your turn or your opponent's turn.Stardust Phantom's second effect is an Ignition Effect and can only be activated in your own turns. The protective effect it applies to a Synchro Monster will work like a continuous effect, it can be protected once per turn in either player's turn.
Yes, it remains on the field and can attack as long as your opponent does not activate another effect.
No, only the player who activated Flute of Summoning Dragon can special summon the dragons through its effect.
Yes. The chain will finish resolving first of all, summoning your Fusion Monster. Elemental Hero Absolute Zero's effect will then activate, destroying your Fusion Monster unless you have a way to save it.
No, it is an Ignition Effect so can only be used in your own turns.
No, because you're unable to remove any cards from play. Since you can't pay the effect's cost, you can't activate it.
Yes, it protects all dragons, regardless of who controls them. None of them can be targetted by spells, traps, or monster effects.
No, because the effect requires you to search for three, not 'up to three'. If you do not have at least three in deck, then you can't activate the effect.
Greenkappa must be able to select two valid targets, or its effect won't even activate. In your case, there is only one valid target, so Greenkappa will not activate.