A great upgrade philosophy for any pre-con focuses on three key areas: the mana base, card draw, and interaction
With Ygra, Eater of All, I got to play Curious Herd to make a 3/3 Beast token for each artifact target opponent has, after using Ygra to make all of their creatures into food artifacts
Theyre a four mana Green and Blue Creature that makes copies of your Creatures as long as theyve got a unique Creature type
Nighthawks Crimson Vow gave us a lot of great vampires and Henrika Domnathi can be great in the right deck
It makes sense that these cards then are the most valuable in the set, combined with a unique border and foil design that compliments the card art
Atomize Unless youre playing cEDH, Atomize is a borderline auto-include in many Golgari EDH decks, as long as you can reliably make some use of the Proliferate effect