■ You may only cast this card during an attack on your opponent's turn, and if you have a «Dimension Dragon» on your field. ■ [Counter] Nullify the attack. Then, if your opponent's cards have attacked three or more times during this turn, end this phase.
There are things you cannot do no matter how hard you try.
Q2435: If I cast this card during the 3rd attack of this turn, will the phase end?
A: Yes, the phase ends. "if your opponent's cards have attacked three or more times" refers to the number of attack declarations.
Q2436: I cast this card during the attack of a card with the "this card's attack cannot be nullified" ability. What happens to that attack, if there have been three or more attacks this turn?
A: Because the phase ends, attack hit determination is not done. Although this card cannot nullify the attack, due to ending the phase, it skips attack hit determination, and shifts to end of phase. At the point of transition to end of phase, the processing of "attacking" and "in battle" ends.
Q2437: I cast this card when there are three or more attacks this turn. What happens to the "at the end of this card's battle" ability of an attacking card?
A: Because the phase ends, it does not activate. Due to the effect of ending the phase, you skip the play timing at the end of the battle and shift to end of the phase.
Q2438: I cast this card when the opponent's cards have attacked three or more times this turn. Do you [Stand] an attacking card with [Double Attack]?
A: Because the phase ends, [Double Attack] will not be triggered.
Q2439: When you cast this card when your opponent's cards have attacked three or more times, and ending the attack phase, we move to the final phase. If this card is cast during an attack in the final phase, will the final phase end?
A: Yes, the final phase ends. Regardless of the phase, this card refers to the number of attacks during that turn, and if there have been three or more, it ends the current phase. If the effect of ending the final phase is resolved, you will move to the end of turn.