76% Winrate to Legend Rainbow Death Knight

Update (Feb 23 2024): Took out one Plague Strike and Frost Queen Sindragosa, added one Gold Panner and one Malignant Horror. Needed the extra card draw and corpse spending. Currently battling at Diamond 3 with a 75% winrate across 55 games. Warriors account for most of my losses, although twice it was because they generated Disruptive Spellbreaker off an Azerite Gem and discarded my Climactic Necrotic Explosion when that card would have almost certainly won me the game.

Update (Feb 25 2024): Just hit Legend! Win rate is 76% over 66 games. For added satisfaction, final boss was Warrior!

For a more detailed discussion of piloting the deck, read this article.