I'm gonna vote yes, however I'm a little on edge with this. If mutagen was added to the arena, that would make it harder to reach deity, and therefore get less of the other rewards you will need. I think the highest I got up to was 100k souls, which I believe is tyrant although I'm not too sure, so adding mutagen in too will just make it harder to get other rewards and you will need alot more than 11 attacks a day to get you to dirty. If mutagen will indeed be added in to the arena, then it would make sense for shards to be added in too. Say for example, your first rank of shards would be 10 of a random hero, second rank of shards being 50, then 100, and lets say 200 is the most shards you can get as a reward. This is just my opinion but whatever happens, hopefully we get more than 11 attacks a day so we have a better chance of getting these rewards.