I had some success with a Templar based Threbin. Maybe it is just your particular Deck build that is the issue?
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I think that Voracious Arachnid needs 1 less health.
I don't think Raven's Gambit is an issue at all. I think people are put off because Victor is now a lot more competitive and people aren't used to him being a threat (that being said I think he was quite good in DP, he's just better now). Gambit is a needed card quite frankly, it provides semi stable draw for Hunters as a whole and is a great control tool as well. I use it extensively in my Gwen deck to deal with all those pesky 5 health allies.
One thing I would consider is reducing Deepwood Bobcat's health to 4. Considering how easy it is to get him to haste I think it's a fair move. 5 health makes him very hard to remove after he hits the play.
Arachnid IMHO is a little underwhelmig TBH. It is only really shines with Elementalis, Banebow, Shervox and Zaladar. And in order to make good use, you must be ahead aside from Elementalis.
I tried it in my BB and I found it was a little win moar than something useful. Found myself saccing it a little more than I used it.
Havent messed with ravager cuz they just dont look like they r worth my time.
Ravens Gambit is just fine
Cap AW and FW like champ. Maybe not as low, but def needs a cap.
Desperate Tactics is strong with Amber and Rothem..make it not target hero.
I would like to see Aramia being able to cast 4cc items or 3cc abilities. .. this may be because I'm playing a lot with her and it's quite difficult to win (with a lot of different meta decks)
Being able to search and autocast 3cc abilities from deck means she can pop all those fireballs right on enemy hero without having to draw them or pay for them with resources.
That could become a very annoying rush hero and then finish up with searching for 2 fireballs in deck.