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Yep you can and you should buy 2 cos 3 is overkill cos you draw it too much. Good Luck XD
Yes you can use it on your opponents turn.
Can Dark Smog be used during your opponent's turn?
I'm deciding whether or not I should buy Dark smog for my Dark World deck but I want to know if the effect can be used during your opponent's turn. Because it's a Trap Card and also Continuous I would think you can but it says, "Once per turn" So can you use it during your opponent's turn or only your own turn?