Until the End Phase, all effects that add or subtract ATK or DEF are reversed. (Additions now subtract, and subtractions now add, instead. Multiplications and divisions, including halving/doubling, are not affected.)
If your opponent doesn't pay attention and activates Mirror Wall before the Damage Step (because they have something such as Enemy Controller face-down), then you can. But generally speaking: no, you can't.
I mean, if your opp has a set or two and a mon in face up attack mode, you got a 2/3 chance of it being WoD or M Wall. So throw it down and then attack.
"The effect of this card cannot be activated at the damage step."
Well, but it can be activated at the battle phase, when an opponent does an attack.. so.....
the damage phase occurs during an attack within the battlephase. so while it can be activated during the battlephase there is a specific time during the battle phase where it cant be activated
it does destroy, but doesn't negate activation. twister only useful if u use it on a spell that has to be on the field in order to maintain it's effect. example: field spell, equip spell, continous spell, continuous trap. it doesn't work (mostly) against quick play/normal spell, normal trap. counter trap is a chain speed above, so it doesnt work either
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