Noob question:

If I use this card (Action: When this unit attacks, one target unit cannot defend against this attack.) on an already declared defender, will it work?

Thank you in advance.

Regards.

Aaron

I just remembered that the rule book says that the word "cannot" overrides everything. Then I guess the card will work even if it is used against a unit that has already been declared as a defender?

Any opinions regarding this are welcome.

Thanks.

You take that action in the window right after you declare all attackers. So this is before any defenders have been declared.