BBD is the set code for Battlebond, and ODY is for Odyssey. The deck that you made has a lot of cards from those two sets, so Deckstats automatically added these tags. You can remove these tags, and even add your own.
The reason that decks have tags is so you can search up decks with similar tags. Say you're trying to make a lifegain deck. You can just search for decks with the tag "lifegain".