As a trap card, you cannot activate it on the turn you Set it. However you can activate it in any turn after that, including your own, if you wish.
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Yes, as long as it's your own turn. If you want to activate them in the opponent's turn, you need to have Set them on the field during your own.
Since DD Sprite can only be summoned during your own turn, its trigger will activate in the opponent's Standby Phase.
As a trap card, you cannot activate it on the turn you Set it. However you can activate it in any turn after that, including your own, if you wish.
No. It is an Ignition Effect, meaning you may only activate Snipe Hunter's effect during your turn.
It is an Ignition Effect, so can only be activated in your turns.