EDHREC has an Oathbreaker site that works exactly the way EDHREC works. It never came out of beta but it works well.
https://oathbreaker.edhrec.com/
This is great, thanks! I'm sure it'll be a huge help to me and my friends as we build our first Oathbreaker decks.
Bad news, the site just came offline.
Ouch, I really liked that site for my oathbreaker decks, too bad the format never really caught on, it was really fun.