While Edgar Markov's other ability definitely makes attacking with it successfully valuable, just casting Vampire spells in general will amass a favorable board state
Streets of New Capenna is having a pretty profound impact on Standard
Also, building decks was always one of my favorite things (maybe even more than playing)
No matter what Zombie Commander you go with, there are some universal Zombie-specific cards that you should have your eye sockets on, including Grave Defiler, Rooftop Storm, Zul Ashur, Lich Lord, Lord of the Undead, Lost Monarch of Ifnir, Unholy Grotto, Necroduality, Undead Warchief, and Zombie Apocalypse
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Then when someone casts their first spell, you can deal its cost in damage to another player like a certain Time Spiral legendary powerhouse that dominated multiplayer back then too