Disclaimer: I will not focus on Art or grammar, unless the latter would make the deck too difficult to understand.
Caspian Ashenwood time - has some interesting similarities to Argus Umber of this Game Jam, actually (Maw). I'm not sure if this is coincidental, but I found it neat.
Now, for actual thoughts... I honestly like this hook a great deal? I normally tend to be a bit unreasonable on having precise information to work with as a GM, but with Lovecraftian stuff, the vagueness is part of the appeal. So having it in the air whether the creepy disappearances are real or just mundane things going too far - or my personal favorite, it seems as if it was all a hoax, except a stinger has it shown that there in fact was something freaky going on under the surface - you can work with either way. The gimmick of the deck is also really interesting, and it's honestly a shame to hear you didn't have as much time to work on it as you might have wished.
What points of criticism I'd have for this deck seem to have been tread already in this chat. But to reiterate, yeah, I have to agree that the win condition for this deck is rather hard, and the gimmick of sacrificing your own Warriors runs into a bit of a problem if you can't steadily bring them up to. To borrow actual parlance, the card advantage is tough for the deck with the gimmick, so the effects really have to make up for it with either the strength, or you need really consistent access to said sacrifices. But as is, it seems quite easy for a PC to get the upper hand here.
Honestly, I hope you get to work on this after the Game Jam! There's a lot of potential here (sacrificing your opponent's cards maybe as worthy offerings)?
Good job!