Corbett is pretty darn great. He’s written a number of useful guides/articles on the Competitive Hearthstone reddit as well.

It seems that Flark is also a final boss option in addition to Goya. I’m on my second go at the final boss and this is the second time I’ve drawn Flark.

Why do you need Stampeding Roar? Can’t you go Anaconda + Wrath + Naturalize the Mecha’thun (7 + 2 + 1) for the same effect with one less card?

Bonemare is pretty good too. Turn 1 Hobgoblin/Bonemare on Coin is a nifty 16 stats.

I replaced a glimmerroot for one.

N’Zoth is sometimes enough, plus a well-timed Sylvanas-Shield Slam suicide to steal a key resource is a big boost. Otherwise Gorehowl for the value game and drag them to fatigue. If your ladder experience is a lot of control matchups, though, the Golden Monkey is a good add.

Why don’t you like the portals? They’re pretty good Shield Slam activators, especially in fatigue-type matchups where you don’t want to use Shield Block because of the draw. Plus they generate a board presence, which can be used for trading or to draw out a removal. Elise is a decent addition, but only has a really noticeable effect against control decks that have transform-type spells (Polymorph, Hex) that can nullify your N’Zoth turn or in the control warrior mirror.

Alex is a very flexible card in this list.
1. Against aggro, it’s an emergency heal. Use your removals to run them out of resources, tank some damage with your face and carefully manage your life gain/armor up to keep just out of lethal/burst range, then Alex back to 15 when they’ve run out of steam, flipping the table so that you become the aggressor.
2. Against control, it’s a set-up for lethal burst from an enraged Grom.

Chillmaw? I imagine it’s because this deck is very midrange-y and he’d nuke your board, too. Turns 4, 5, 6 are when this deck starts taking board control.