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Can you activate a card effect that reads 'once per turn' outside of your Main Phase in Yu-Gi-Oh?
It depends on what the effect actually 'is'.
If the effect specifically responds to another action, like a negation effect, then it is a Quick Effect and can be activated at (almost) any time during your turn, and again during the opponent's turn.
If it waits for something to happen and then automatically does something, then it is a Trigger, which is spell speed 1 but will activate at any time, when the condition is met. So it can activate at almost any point in your turn, and again, in the opponent's too.
If the effect specifically says that it can be used in the opponent's turn, this by default is a spell speed 2 ability and can be activated at almost any time in either turn.
But finally if the effect has none of the above, then it is just a regular Ignition Effect which can only be activated in your own Main Phases. Being 'once per turn' alone does not tell you what type of effect it is, or when it can be used. Once per turn Ignition Effects are actually 'once per YOUR turn', and cannot be used in the opponent's turn either.
What else can I help you with?
Can you activate Skull Lair during any Phase of your opponent's turn in Yu-Gi-Oh?
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.
Yugioh Does sloar flare dragons effect of 500 damage last for one turn or every end phase?
It lasts every end phase.
Can i activate cloudian - altus's effect during m opponents main phase?
No, you can't.
Can your opponent activate a card during your standby phase?
Yes, as long as it is Spell Speed 2 or 3, and Set on the field previously in the case of a Quickplay Spell or Trap card. That means the opponent can potentially do something before you get your first opportunity to activate a spell speed 1 card or perform a summon.
Can you activate your Trap card during your End Phase if your opponent's Zenmaines' effect targeted it in Yu-Gi-Oh?
Yes, of course. Trap Cards can be activated in the End Phase.
What is a standby phase?
Standby phase is in a yugioh duel after draw phase,you could use card effect at standby phase.
In Yugioh can activate a magic card form hand during your main phase 2?
Yes, of course. Exactly the same as main phase 1.
Can you activate Skull Lair during any Phase of your opponent's turn in Yu-Gi-Oh?
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.
Yugioh Does sloar flare dragons effect of 500 damage last for one turn or every end phase?
It lasts every end phase.
Can 'Stardust Dragon' use its effect in the battle phase?
Yes, Stardust Dragon can activate its negation Quick Effect in the Battle Phase, and even the Damage Step.
Can i activate cloudian - altus's effect during m opponents main phase?
No, you can't.
In Yugioh can odin come back two turns later when no tuners are in the graveyard until two turns later please state your information even if its from your head?
Odin says that if he is destroyed, you may resummon him by removing a Tuner from your graveyard, during that turn's End Phase, ie, the turn in which he was destroyed. If you have no Tuners that turn, then you can't activate this effect, and if you pass that turn's End Phase, then you have passed the time to activate it, so it does not matter to Odin if you get a Tuner in your graveyard after that.
Can your opponent activate a card during your standby phase?
Yes, as long as it is Spell Speed 2 or 3, and Set on the field previously in the case of a Quickplay Spell or Trap card. That means the opponent can potentially do something before you get your first opportunity to activate a spell speed 1 card or perform a summon.
Can you activate your Trap card during your End Phase if your opponent's Zenmaines' effect targeted it in Yu-Gi-Oh?
Yes, of course. Trap Cards can be activated in the End Phase.
Can you activate a monster effect that reads 'once per turn when this card battles' during your opponent's Battle Phase in Yu-Gi-Oh?
Yes. To be used in the battle phase, it must be a Quick Effect, and if it's a Quick Effect then it can be used in either players' turn.
When can you activate demise king of Armageddon's effect?
If you know about the card Judgment Dragon, it's pretty much the same thing. You can activate its effect as many times as you want during your Main Phase 1 or 2 to blow up the field except itself.
Can you activate D.D. Sprite's effect during your opponent's turn in Yu-Gi-Oh?
Since DD Sprite can only be summoned during your own turn, its trigger will activate in the opponent's Standby Phase.
