So here's the problem I had during the November 2019 format: I was living on my own at University with none of my collection on me but I really wanted to play Yugioh at locals and attend an upcoming Regional in my area, so I decided to build a Zombie Deck using just the Zombie Horde Structure Deck cards. At locals I did just kinda okay with it, but for the Regional I wanted a much better list.
So I went ahead and bought more structure decks: This time I got cards from Order of the Spellcasters and Rokket Revolt and built this list for the upcoming regional. My final result of that regional was 69th place (out of 105-ish players) with 2 wins, 2 losses and 3 draws.
So if you're looking for a super budget Zombie Deck to build, the entire main deck can be purchased for roughly $40 and the Extra Deck only really needs Red-Eyes Zombie Necro Dragon which you can get from the Structure Deck also.
My regional list did use a Side Deck and much larger Extra deck with the cards that I had at the time, but I barely used anything from my Extra Deck and the Side Deck is completely up to you if you want to construct one.
90
210
810
540
