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I have this question too. But from the perspective of the dice itself it will tend to be biased to on side of it self. So either it is biased towards the 1, 2, 3, 4, 5 or 6. So those are six bias options. I guess, I am not an expert, that this will reduce your entropy significantly. Let's say you use only one dice that tends towards the side with the number 5 more then the other sides and you throw it 256 times. I think you will throw significantly less combinations, meaning this bias will lead to guessable seeds. I don't know what will happen to your entropy if you would use 256 different dices. Does 256 biased dices lower your entropy? Probably not if they do not have the exact same bias. But maybe an expert can answer this question.