TOXICC

I think you need to let the idea of "one deck for every map" go. rPVE has different requirements than std/adv campaign maps. Some expert maps can be done with "normal" decks, others get a lot easier with a purpose-build deck.
But there is one important thing to know: If you are not speedrunning, you can make pretty much any color combination work on pretty much any map. So you can freely choose the colors you want to play and then build a deck around it
 
For Shadow/Nature: Decide if you want to play shadow T1 or nature T1. Then, decide the general direction of the deck: nature or shadow as main components?
What I see from your deck is a focus on shadow with a light nature splash for some heals and a little bit of CC. Generally it is a good idea to stick to one or two main units per tier and support with spells. Charges are no problem with shadow as you can use offering (g) to replenish them quickly and even circumvent recast delays on cards like frenetic assault. Also, shadow has some pretty good options for void manipulation with the most popular being furnace of flesh + cultist master.

Hi everyone!
 
5 years ago, I started this project alongside Blank, it's been a fantastic journey so far, I'm so happy that we managed our goal, which was to play this awesome game again, with you all! I won't lie, it's been hard, we didn't sleep much, it was all in our free time, but in the end, it was worth it, I don't regret any second I've spent on this project. But as some of you know already, I've stepped down a bit from the project, and I focused on my main indie-dev activity, to create my own games. The whole team did a fantastic job maintaining it, and we've progressed a lot since then, to a point where we're closer than ever to official release!
 
But.. all things must come to an end (not the project, don't worry) - But I'm officially taking a step back from this project, starting today. I'll still be around in the back, to help the team if needed, I'll do some paperwork mostly, but other than that, I won't be here with you guys! But don't worry, I'll leave you in good hands.
 
@Ladadoos & @Zyna are taking the lead of this project! They've shown great support & motivation within the years, and I'm confident that they'll handle this project very well!
 
Future is bright Skylords! I hope I'll see you all again someday, I've loved talking with all of you, playing with all of you! This project meant and will always mean a lot to me, love you guys! (I won't cry)
 
See you! ♥

One thing you really need to do is go through there and sort out all your orb requirements. You have a lot of pure shadow cards but also nature cards sharing the same tier that you can't even use until the next tier at the earliest. When do you even grab your green orb with this? I actually can't tell.