I rolled a 20-sided dice. My opponent called a judge and said only 6-sided dice could be used for effects. My opponent said this was announced as official at another Battle Road (but not at this one). The judge suggested that I re-roll. It is my understanding that the (Head) Judges can allow/dis-allow any dice he/she wants (if he/she decides it to be unfair), so I abided by the decision. I would have greatly preferred if some announcement allowing only 6-sided dice had been made at the beginning of the tournament, however. So finally the questions: 1. Does the announcement have to be made at the beginning or can a (fair) dice be dis-allowed at any time (even in the middle of a match (which hurt the most))? 2. Is there an official ruling that I am not aware of that says only 6-sided dice can be used (regardless of the judge)? That is all. I doubt it would have made a difference in my game, but something to know for the future none-the-less.