Check out this Dragon Warrior Deck with Rend Blackhand as a tech. You may have forgotten about Rend, with a dragon in hand this card will destroy any legendary minion!
Think about it, how many decks do you face that run powerful legendary minions, most right? It’s only really Zoolock and Aggro Shaman that sometimes don’t have a legendary minion but you don’t rely on late game vs aggro like those decks anyway.
I think Rend Blackhand is a great tech choice and I will be climbing Season 29 with this deck and seeing how it works out. It’s a good answer to Ragnaros, Grommash, C’thun, and more.