Still the curious question is the text. Once per round is that the same as a turn or a game (a single round in a tournament)? IF it is once per game then I doubt you will see this card anywhere.
If they wanted it to be a one use card it would have been worded like this:
You may change a friendly ship's die result to any other die result. That die result cannot be modified again. After modifying the result, discard this card.


