Reached 138 Legend with this Dragon Highlander list, it's hard to write a guide about it since every card is 1x so every mup and situations are different and need a specific approach.
I'm also an experienced Coach if someone is interested in reaching legend, even from rank 50 it's possible with the correct application. The coaching IS NOT free but also not that expensive, if you're interested send me an email at : firstname.lastname@example.org or a private message on my Twitter page (i have dms open) where I'm also doing a giveaway of some classic packs: https://twitter.com/IamNovaChrono.
My battle tag is ImNovachrono#2933, make sure to add me on EU server for any question if you play on NA or Asia, otherwise i won't see the request.
Good luck and have fun if you try my deck !