Tatsunecro + Mezuki = Summon Tatsunectro and synchro with the 2 for Red-Eyes Zombie Necro Dragon then use Mexuki to get Tatsuneco back for Sunsaga
Zombie World + Super Poly = Summon Dragonecro with your opponent's monsters!
Necroworld Banshee is good graveyard fodder and can be sent by Zombie Master, Tributed for Red-Eyes Zombie Dragon, or Used for Synchro. (Preferably with Tatsunecro)
Banshee + Tatsunecro = Synchro with Tatsunecro for Ancient Pixie Dragon, then banish Banshee for Zombie World.
Plaguespreader Zombie + any lv 4 = Synchro for a lv 6 then use Plaguespreader's Effect and Synchro again for Beelze (if the other material was Mezuki you can summon Plaguespread again for Sunsaga)
Zombie World can be searched with Banshee, Terraforming, or Metaverse and should be done so quickly because the effects of cards like Doomking Balerdrach, Doomkaiser Dragon, and the 2 Red-Eyes depend on it, while it also supports Super Poly, Return of the Zombies, and Zombie Master.