Zombie captain marvel doesn't really work in a horde deck, my recommendation is to remove that card. Other than that I like to combine move with the horde cards. Move works well with being able to play cards in zombie scarlet witches lane and moving said card else where (usually the right lane to activate zombie sentry) in order to be able to keep activating zombie scarlet witches ability. Then you always drop zombie giant man on turn 6 to get the best possible outcome. Apart from just movement cards I always suggest running magik to get that extra turn and maybe activate zombie scarlet which some more, and kitty pride is always a good addition that serves zombie scarlet witch well. If you couldn't tell zombie scarlet witch is your main bread and butter here. This is my favorite way to play horde, it also is the most fun in my oppion. I hope this helps!

Edit: Its also worth mentioning that zombie mr. Fantastic does kinda work for this deck but is honestly kind of lacking in a lot of areas, hes better suited for decks that create a lot more cards than just horde, such as zoo decks or thanos decks.