This deck focuses on Zombie's ability of reviving and activating effects from the graveyard. This deck is also good at thinning their deck by sending Zombies to the graveyard to be revived while also allowing you to draw into your other useful cards quicker. With the removal of Red-Eyes Spirit from the semi-limited list, Red-Eyes have gotten a boost and returns to become a more viable rogue deck.
Red-Eyes Zombie Dragon is your boss monster and with this deck you can very easily summon him from the deck, hand, graveyard. Being both a Zombie-type and a Red-Eyes monster gives him access to lots of support. Being 2400 attack makes him a decent beater but you will still need skills like Beatdown and Straight to the grave to get over other boss monsters. Red-Eyes also has an effect that was previously less relevant outside of dueling other Zombie decks because he is only to steal your opponent's Zombie-type monsters. But now that we have Zombie World and the skill Posthumous Army, you can turn your opponent's monsters into Zombies and have Red-Eyes Zombie Dragon take them when destroyed. Zombie World can also be disruptive to other decks because it turns all monsters on the field and graveyard to Zombie-types, shutting down some synergies. Like locking some Spellbooks from being used since there will be no Spellcasters on the field, or with Pulse Mines since there would be no Machines.
Red-Eyes Insight is a 1-card combo to get Red-Eyes Zombie Dragon out. Use Red-Eyes Insight to send Red-Eyes Zombie Dragon to the graveyard and search out Red-Eyes Spirit from your deck. Set Red-Eyes Spirit and then use it to revive your Red-Eyes Zombie Dragon. This combo also thins your deck by 2 cards so that you can draw into other useful cards easier.
Gozuki and Samurai Skull both have similar effects and are decent beaters on the field. Use them to thin your deck and put Zombies in the grave where you can special summon then. When Gozuki is sent to the graveyard you can banish a Zombie monster except Gozuki to special summon Red-Eyes Zombie Dragon from your hand. When Samurai Skull is leaves the field because of your opponent's card effect, you can special summon a level 4 or lower Zombie monster from your graveyard.
Even though your Zombie monsters can be considered good beaters, they can still be overpowered by other monsters , especially other boss monsters and you will have to make them survive till your turn to give them an attack boost with Beatdown. Bacon Saver is able to negate an attack by banishing himself from the graveyard, and since he is a Zombie monster you can put him from deck to the graveyard with Gozuki or Samurai Skull. Enemy Controller can be used to negate an attack by changing the attacking monster to defense position. Enemy controller can also be an OTK enabler by stealing your opponent's monster and opening for direct attacks.
How to Use (Old Version)
Gozuki and Dark Dimension
Gozuki plays quite an important role in the deck, and having multiples in the deck might be necessary. You can summon Gozuki and send a zombie monster from your deck to the graveyard. This allows you to later special summon a Red-Eyes Zombie Dragon from your hand when Gozuki gets destroyed. Alternatively, if you have a zombie monster already in your graveyard, that's not Gozuki, then you can activate his ability when it's on the field to send a Gozuki from your deck to the graveyard. This will let him activate his second effect, so you can summon Red-Eyes Zombie Dragon from your hand. The banished monster can then be special summoned using Escape from the Dark Dimension, giving you 3 monsters on the field in a single turn pretty quickly.
Starting with Red-Eyes Wyvern can help make some plays. If you don't summon/set any monster in a turn, you can attack your enemy using Red-Eyes Wyvern, since it can still be beneficial even if it gets destroyed.
Red-Eyes Zombie Dragon's effect won't really be useful if you go against a non zombie deck, but what separates it from the normal Red-Eyes is its synergy with Gozuki so you can special summon it, and its ability to tribute summon using only 1 zombie monster.
Since special summoning the monsters often require them to be in the graveyard, use these cards to send them there.
Enemy Controller protects your monster, but can also be used to tribute yours to send it to the graveyard. This can activate Gozuki effect and special summon from your hand.
Rising Energy can also be used offensively, or defensively, but the effect of discarding a card is something that's positive in the deck, instead of losing a resource.
Lastly, the other way to send them to the graveyard is to use the Last Gamble skill. This is mostly good and only recommended as the last option since it will leave you with 100 LP. Attacking carelessly can end up losing you the duel instead.
So... I miss this deck being awesome. There's a couple ways to work with this ->
Obv. you can't run e-cons and sam skulls, I prefer skulls, you can bump to 2 bacon if you're really worried about being under siege. Offerings to the Doomed can help with crowd control, and Zombie World can help you maintain field presence or botch and opponent's plays but i'd recommend Beatdown if you're going that route, just because REZD isn't that strong.
Power of the Guardians can be helpful-ish, but your REZD is still very vulnerable to removal, the spell is vulnerable but when it works - it works great.
2/2 for Insight and Spirit are fine, otherwise staples like: Wall of D, Dimensional Prison, The Wandering Doomed.