You kept getting poisoned? By WHO? I'm used to them trying to light me on fire more than anything. Not poison. Also you should be aiming to fight either the shortest girls starting out, or figuring out who has the weakest attacks to tank. Please tell me you are playing on Easy, until you get to a new game+ file it is NOT suggested you play on normal.
Also yeah the void list I do agree with, that could be shown better. But I've never had a problem when discarding multiple cards.
As for your third point, trading post is comically one of the best cards in the game, I put it at 1-2 copies in EVERY deck I make. It's 2 mana to cycle your cards and adds a free removed card. There's lots of cards, and 2 of the absolute best cards in the system that care about removed cards in a fight. Those being Unending Feast (epic so max of 2/deck) from the Zombie pack, and Space Force Assault - Arabella (Rare 3/deck) from the Defenders of the Universe pack (the one just to the left of the Zombie pack).
These 2 cards are essentially your staples mid game after you have a deck built up if you want to get to crazy numbers. Build a zombie mill deck and watch things SPIRAL. Building around things like Zombie King/Matriarch/Necromancer/Looter/Giantess/Priest (Giantess is excellent in a deck like this in a prolonged game) & Corpse Eater/Skulls of Decay. Add in Space Force Hero - Athena if it feels like things are out of hand. Keep a trading post in hand always and it will eternally buff Unending Feast. When you want to KO the opponent just start using Arabella on them.
Before you get to that point you should be prioritizing the base pack and getting parasites. Primarily the succubi/Magus/invader with Fairy. Dark fairy if you are confident in your decks, but I wouldn't recommend unless you have hp to spare. If you don't get one of those 3 in your first 10 pull (50 cards) I suggest a reset.
As for every card there's this spreadsheet you can take a gander at: https://docs.google.com/spreadsheets/d/1srPqL1V-EhE1_95GKLnShy7-goNC2f1t/edit?us...