Q: I think I lost all my decks and/or collections, is there any way I can find them through iCloud?

Q: I think I lost all my decks and/or collections, is there any way I can find them through iCloud?

A: Yes, you can. While iCloud does not sync decks, it does store all the files. You can find your documents by checking iCloud | Manage Storage and Backup in your Settings app.
If you are experiencing issues with iCloud, you can check out if any of this info helps:
Apple support
iWriter support