In any form is too vague for me, so I prefer no shards.
The reason is:
1. I don't like the shard rule in leagues in relation to the current form. So far there is no balanced solution.
2. I can't tell you if I like shards in PvP events, cause it really depends on the PvP event type.
3. Shards in tourneys are cool-
sometimes. It wouldn't be fun if we can play Shards every time in weekly tournaments. (I know it wouldn't be like that...) But one tourney out of 15 with shards is okay. When people ask for more, then rather no than yes.
4. In Trials it was fun, but I would like to see shards only in the final match and just with restrictions.
5. War with shards? No way! Elements like Fire, death or Air, which are already very strong would be more powerful. Darkness wouldn't benefit very much of this change. In other words, it would be unfair.
Edit:
Yes to all except BL. BL having shards in use doesn't seem as newb-friendly to me. It increases the chance of people being afraid to enter because they are afraid of tons of rares being used against them. Plus some newbs blame losses on a certain shard or shards being used against them which just makes it less fun at times. I support winning just due to having a better deck overall but having things like 'the deck' or a SoB deck out in BL just doesn't seem fun to me.
That means, it's okay if anybody who has no upgraded shards and who anyway has only 3-5 upgraded decks, has to deal with it in CL?