Bluetracker
Tracks Blizzard employees across various accounts.
Riot, have you considered making a twitch overlay for the game?
So, as you may/may not know, many card games like Magic Arena and Hearthstone have third-party twitch overlays of varying quality that help newer audience understand what's going on. I assumed this was to be expected. Then, I saw a streamer playing this other new game called Mythgard. Long story short, the Mythgard devs made a built-in deck tracker and a high quality twitch overlay, so streamers don't have to resort to third party software.
I think this would be a great thing to spend some time developing, or at least looking into.
_A_Small_Man
Yup! We worked with Mobalytics to help them set up a comprehensive card database & deckbuilding site: http://lor.mobalytics.gg/. You can also see their Twitch extension in action by checking out LoR streamers.
And for other community developers out there, we just opened up the LoR section of our Riot Developer Portal: https://developer.riotgames.com/lor.