Got to legend on day 2 with Egg Warlock. Played other decks before diamond, but I maybe lost 3 egglock games from Diamond 10 to Legend. No official stats due to playing on mobile. Deck code is in the replies.

Made it to Top 500 Legend with Pirate Shaman. The deck has some consistency issues but can basically beat any board-based deck it comes across.

Deck code:
AAEBAYHaAwaRvAL8wAal0wbbpgffpgflpgcM+w/psAOo3gOq3gOKsATDjwbplQb8qAbYwAb2wAatxQax6wYAAA==