Hello,
The Vampire archetype allows XYZ Beatrice to install Zombie World and Doomking.
Uni-Zombie also achieves much the same result.
The aim is to have Zombie World in field spell and Doomking balerdroch always ready for action.
Doomking is Level 8 : Perfect to XYZ The Zombie Vampire
You can find the basic Vampire / Zombie combos on Youtube.
You should learn that before using that deck.
This is a Platinum deck in Masterduel & a 40-60% win in TCG depending on the META.