Want to make your x3 "Immortal Glory" Structure deck a bit more competitive in Masterduel? This deck is perfect for you!
The main strategy of this deck is to establish the "Zombie World Lock" board. While Zombie World + Rivalry of Warlords ensures that your opponent only controls only one monster on their field, Doomking Balerdroch allows a negate + banish once per turn. To achieve this board, Zombie World + Doomking have to be present on the field.
As long as you have this set-up, you're likely to win and everything else that you summon on your field is extra defends your "ZWorld Lock."
This ideal board primarily falls to the crux combo piece Uni-Zombie. Uni-Zombie almost single-handedly achieves this end board by milling zombies from the hand or deck (Necroworld Banshee for Zombie World) (Glow-Up Bloom for Doomking), in addition to providing synchro access.
Shiranui Solitaire allows more ready access to the "ZWorld Lock" board, by summoning Uni-Zombie from deck.
Milling as many cards as possible from your deck/hand to your GY enable this strategy. The "Assault Mode" engine supports milling, since a summoned Psi-Reflector easily makes a level 8 Synchro, which would be Chaos Ruler. Chaos Ruler mills 5 from your deck (hopefully zombies) while adding a combo piece to your hand.
If you have extra monsters on field, Vampire Sucker is the ideal monster to summon. She provides more resources to a zombie player by giving the player a free draw anytime a zombie is resurrected from either graveyard. During the standby phase, if Doomking is in the graveyard and there is a Field Spell on the board, it will resurrect itself, which prompts Vampire Sucker's +1 draw effect (chain link 1) and Doomking's banishment effect (chain link 2). Drawing one card and banishing another on the field/graveyard in the standby phase is often devastating. Often in the first turn, Doomking + another zombie is linked away for Vampire Sucker to allow for this chain to occur during your opponent's standby phase.
While this deck is strong and consistent going first, it doesn't do well to interruptions, negates and handtraps. "Pure" Zombieworld is considered "rogue" in the competitive environment of Masterduel that is overrun with Runick, Branded and Adamancipator. If you truly want to upgrade your "Immortal Glory" Structure Deck, perhaps you should pair it up with Eldlich and Branded.
Also, if your normal summon Uni-Zombie is somehow negated pr interrupted, the turn usually ends there. This deck also has difficulty breaking established boards, as it doesn't have much tools to do so.
All in all, this deck is a fun rogue strategy to play, semi-budget (thanks for the Structure Deck Masterduel devs!), and easy to learn.
GLHF Duelists!