I would recomend the Mulldrifter for zombies: Fell Stinger. Specially with Gisa and Geralf, it's 3 mana draw 2 loose 2 every turn (because you exploit itself and put it in the graveyard)
If you put all your deck in the graveyard the lili and rooftop storm just plays your whole deck. If you sadisi and the combo you can tutor your whole deck. Grey merchant is a great card if not already in the deck,
I got the green white deck, but I decided to go on edh rec to see an average list with emmara as commander the things that were listed in the deck I already had sinse I had the deck already I kept and the rest of the precon I'm gonna sell for store credit to pit it toward the rest of the cards I need I also have chrismas money I can use so I think I can make it happen
Put a demonic tutor for the roof top! Also get a grave crawler and grave pact to make everyone not have a great time. Pharexian alter is kinda cheese. But its a win condition with the 1 dmg to all when creature die cards. With grave crawler just pooping out of the graveyard and sacrifice No sure if you were going for a budget option but these cards are pretty pricey
What about a Breach the Multiverse to ramp up graveyards and gain creatures under your control? Or even Eldrazi monument to help sacrifice creatures mechanic?
What cards are you taking out of this deck and replacing the new cards with? just bought this deck so I can have 3 decks to play with when i'm able to play with my friends.