Video version on this guide (2 cards changed from this list, but the video still works well):
Before anything else, it's important to say that I got the older list (showed at the video) from brazillian streamer NightmareCwb (https://www.twitch.tv/nightmarecwb). My intention with this post is only to provide my approach to the list and also personal data/feedback.
With that being said, I got fairly good results in Legend NA, with 71% WR from rank 1889 to Legend 344, on 57 matches including a 10 win streak on the Top1k. So this inspired me to do this quick guide for you guys.
UPDATED JUNE 1ST: I got legend with a new version of the deck. My friend (also streamer, https://www.twitch.tv/masquecarvalho) Carvalho made that one, and I used it in the final push from diamond to legend.
How to read this guide: Each class will have a quick mulligan guide (what cards you should keep) and each relevant meta deck will have some short advices for the specific matchup as well as a predicted general win percentage. Some decks will be flagged with a "!" meaning I don't have much experience in the matchup, witch means that the advices will be based on other people's opinion and my supositions.
Coin: + Corsair Cache (if you already have a decent hand)
Tempo: 55-60% WR - Don't underestimate his damage and burst potential. Use your Risky Skipper sinergies to get a lot of armor and clear medium/big boards always when possible. You can finish bigger creatures or remnants with Shield Slam. Setting up plays for Bladestorm if you have it can be quite good.
Quest Warlock: 60-65% WR - Get a lot of armor to not die to his combo. Bombs will win you the game if he gets too greedy drawing in the late game. Push his health fast while also being aware of his healings (to not overpush). If you gained enough armor (around 10 to 15) you can use Risky Skipper paired with Bomb Wrangler to explode Boom Bots in the face.
! Zoolock: 55% WR - Be cleaver with your board clears, zoo re-fills hand pretty quickly. Don't forget to push for bombs and face damage too (when safe), since his life total will be already low due to Life Tap usages.
Highlander: 60% WR - Disable her highlander as soon as possible with Wrenchcalibur and you should be good. You can answer threats pretty easily with your removal. Risky Skipper should generaly be used here paired with Bomb Wrangler to explode Boom Bots in the face.
Coin: + Kargath Bladefist (if you already have a decent hand)
! Murloc: 50% WR - Be aware of his buffs, try to clear board with Risky Skipper before theirs minions become too big. When they do, you will eventually need to realy on your heavier removals and may get screwed.
! Libram: 60% WR - His heals may be annoying (be aware of them) but you have a good way to disable his "purity" with Wrenchcalibur. You have also really good board clearers. Use them in a smart way and you should be fine.
Highlander: 55% WR - Despite you having good ways to clear the board and a way to disable his highlander, this match is quite hard. Try to disable the highlander as quick as possible and use Bladestorm advantageously. Also be aware of your life total and combo Risky Skipper with Armorsmith when needed even if it doesn't clear.
! Face/Dragon: 55% WR - Play the most standard way against aggro that you can. Get armor when possible, use your clear tools in a smart way, etc. Bombs should not be that much of a priority in this matchup since you need to be alive in first place.
Coin: Kargath Bladefist (if you already have a decent hand)
Egg/Enrage: 55% WR - You have more resources them him in general, if you two exchange them evenly eventualy he will need to all in and you will win on that. Be careful, his deck has an insane burst potential with Kor'kron Elite, Inner Rage, Rampage and cards alike, so combo your Risky Skipper prioritizing Armorsmith first.
Mirror: 50% (lol) - The one who gets more armor, in general, wins. You will want to me more responsive than your opponent so you can use the resources in your favor. But be careful to not be more passive than you should. Try to maximize your bombs.
Galakrond (Tempo/Secret): 60% WR - She can't heal, so feel free to push damage when you're able. Try to maximize your bombs quickly so she can't use Galakrond, Azeroth's End, Wanderous Wand, and sometimes will need to keep 10 on hand to not die from bombs. Risky Skipper should be according to the game state, always to clear, but sometimes to clear + armor or clear + bomb damage.
Highlander: 65% WR - She can't heal, so feel free to push damage when you're able. Disable her highlander as quickly as possible with Wrenchcalibur. Try to maximize your bombs quickly so she can't use Galakrond, Azeroth's End, Wanderous Wand, and sometimes will need to keep 10 on hand to not die from bombs. Risky Skipper should be according to the game state, always to clear, but sometimes to clear + armor or clear + bomb damage.
Big Spell Druid: 50% WR - Bladestorm is insane against Glowfly Swarm. Save Brawl to the big dragons that will come out of Ysera, Unleashed's cards and also Exotic Mountseller. Besides this, you should feel free to push bombs and cheap damage in the ealy game, he will be defenseless. Druid doesn't heal thaaat much, so 3-4 bombs and a later push with Boom Bots should do it.
Does this class even exist in 2020?
Coin: + Kargath Bladefist (if you already have a decent hand)
Highlander Priest: 30-35% WR - A lot harder than avarage. You should maximize your bombs as much as possible, an disable his highlander before it becomes useful too. In general, you will win trough his eventual possible misplays and bad draws. Besisdes that, you should play like you would against Highlander Mage and hope he doesn't heal insanely. Be aware of his board clears as well as stealing cards, those will be key. Don't push long games, try to burst him down when he draws bombs.
Galakrond Priest: 20-25% WR - Almost impossible to win agains a good player, and even harder against a good player with a good hand. Try to maximize your bombs, and force him to play Galakrond, Azeroth's End as soon as possible so he can't hero power anymore. Don't push long games, try to burst him down when he draws bombs. Prey.
You can go for a more board focused build of this deck, witch holds better against aggro:
If you're getting Rogue, Warlock, Priest, Mage and not much aggro you should try:
Zephrys the Great - Good in long matchups, may be a viable pick if you feel like you're going a lot against control (not priest though, reasons in this classes' matchup section).
Deathwing, Mad Aspect - Really good against enrage warrior and rogue. Decent against DH too.