Expansion card questions: I have a question about the game state rule and “cannot”. At one point it was ruled that an attack that…

Question

I have a question about the game state rule and “cannot”. At one point it was ruled that an attack that dealt 0 damage due to damage reduction effects couldn’t be played, but that ruling was overturned, to say that: “Acrobatic Move will always have a “legal target”, the villain, even if the villain might have a way of blocking that damage—[Caleb] argues Gamora should be able to attempt the attack, even if it doesn’t do damage.” What if the villain has an ability that says he “cannot take damage”? Does that somehow make the villain an illegal target or is it still allowed to play the attack (for other desirable interactions)? What if the attack does something else (such as Black Widow’s Attacrobatics canceling boost icons), can I play it for the non-damaging effect, or is it disallowed to play the card because it would damage the villain? Finally, what if the ability I want to use deals damage to an enemy (such as Energy Barrier), could I use that ability, or does being unable to damage the villain somehow prevent it?

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