I tried this one on top 300 legend EU yesterday on stream and it performed quite well. I think this deck got better with time as soon as meta changed a little.
I didn't try to play DK on wild, unfortunately. I cannot tell you about that. But, usually, the best decks on Standard can reach legend in Wild, too. Sometimes it might need a couple of cards switched to stronger ones, but still.
But, I might try to play wild in the future. I can see that a lot of people on RU-vid are interested in that game mode. Who knows, maybe DK will be the first class to try ;)