Yu-Gi-Oh! Master Duel is the best way to play the card game through an automatic, fully online simulator. With Master Duel, almost every card ever released is available on it. Since it uses a banlist more heavily related to the OCG, many decks that fell off in the TCG are playable, and sometimes even meta in Master Duel.
Among these is Virtual World, a Synchro-focused Archetype, built around climbing up into high-Level Synchro Monsters. They can generally very easily end with cards like True King Of All Calamities and other Floodgates on the field to completely shut down the opponent on their turn.
10 Virtual World Hime - Nyannyan
Virtual World Hime - Nyannyan is one of the cards that allow Virtual World to be able to go into their high-Level Synchro Monsters. When it's in the Graveyard, you can special summon it anytime a Level Three Monster is summoned onto the field. When it's summoned this way, Virtual World Hime - Nyannyan becomes a Tuner Monster.
Since there are plenty of Level Three Monsters Virtual World decks will be playing, using this effect will happen in practically every single duel. Virtual World Hime - Nyannyan is a must-run in Virtual World decks, and one of its best Tuners.
9 Virtual World Xiezhi - Jiji
Virtual World Xiezhi - Jiji is one of the easiest cards to summon onto the field. All you have to do is target a Virtual World card on the field and send a card of a different type from the deck to the Graveyard to special summon it. Alternatively, you can easily normal summon it to allow other Virtual World Monsters with similar effects to get going.
Virtual World Xiezhi - Jiji has a bit of a slower effect on its special summon, as it allows you to put a Virtual World Monsters from your Graveyard back into your hand.
8 Virtual World Kirin - Lili
Virtual World Kirin - Lili has the same special summon effect that most other Virtual Monsters have, targeting a card to send a card of a different type to the Graveyard to special summon itself. Virtual World Kirin - Lili lets you dump two cards into the Graveyard for its effect.
Plenty of Virtual World cards like being in the Graveyard, as others rely on themselves being there, or banishing cards from there to trigger their effects. Virtual World Kirin - Lili not only puts a body on the field for Synchro and Xyz plays, but also helps set up the Graveyard for your other Virtual World Monsters.
7 Virtual World Roshi - Laolao
Virtual World Roshi - Laolao is one of Virtual World's combo extenders. It has the effect to special summon itself from the hand by sending a Virtual World card of a different type from a targeting Virtual World card. Once it hits the field, Virtual World Roshi - Laolao can special summon another Virtual World Monsters from the Graveyard that wasn't sent there with its own effect.
This allows Virtual World Roshi- Laolao to bring back Virtual World Monsters to either go into Level Nine Synchro Monsters by using its Tuner or to make one of their Rank Six Monsters if it revives another Level Six one.
6 Virtual World Gate - Chuche
Virtual World Gate - Chuche is one of the only Trap cards available in the Virtual World Archetype, and it's also their best Trap card. It can be placed directly onto the field with other Virtual World cards, which gets around one of the common weaknesses Trap cards inherently have.
Once it's on the field, Virtual World Gate - Chuche shuffles two of your banished Virtual World cards into the deck to destroy a card on the field. This not only lets you recycle your banished Virtual World cards but also lets you disrupt the opponent's turn to stop them before they snowball out into their combo.
5 Virtual World Gate - Qinglong
The sole Continuous Spell card in the Virtual World arsenal, Virtual World Gate - Qinglong is a solid piece of the Virtual World Archetype. It's helpful when you're going second, as by banishing a Virtual World card from your Graveyard, you can negate the effects of a Monster the opponent controls for the rest of the turn.
Since it's one of the only Spell cards, Virtual World gate, Qinglong is great for setting up the special summon effects of other Virtual World Monsters. You'll always have Monster cards you can send, which is what makes Virtual World Gate - Qinglong such a staple in Virtual World decks.
4 Virtual World Phoenix - Fanfan
Virtual World Phoenix - Fanfan is one of the Xyz Monsters that Virtual World has access to, and it's the best one in the Archetype. It requires two or more Level Six Monsters to Xyz summon, and once it hits the field, offers some of the best removal in the game. By detaching two materials from it, you can banish an opponent's card and a card in either player's Graveyard.
Banishing is one of the best kinds of removals in the game, as not very many decks can interact with cards there. It can also disrupt your opponent by taking a card they need in the Graveyard out of there, potentially shutting down their entire strategy.
3 Virtual World Kyubi - Shenshen
Virtual World Kyubi - Shenshen is the Level Nine Synchro of the Archetype, and easily its best. When it's on the field, any card that would be sent from the field or the Graveyard is banished instead. This Floodgate effect is so good, it can completely shut down entire decks with it alone.
Virtual World Kyubi - Shenshen is very hard to get rid of once it's Synchro Summoned as well. If it's in the Graveyard, you can banish two Monsters of different Types and Attributes to special summon it back. It also has a high statline as well, making it that much harder to deal with.
2 Virtual World City - Kauwloon
Virtual World City - Kauwloon is the only Normal Spell card in the Archetype, but it's one of the reasons the deck is as consistent as it is. Virtual World City - Kauwloon allows you to put a Virtual World Gate card (their Continuous Spell and Trap cards) directly onto the field. This allows you to easily set up for Virtual World special summons.
Virtual World City - Kauwloon is so good since it allows you to easily play their Trap cards, allowing you to play them without having to Set them. While Virtual World City - Kauwloon has other effects, most of the time they will be irrelevant, since you'll always be playing it for its primary effect of putting a Virtual World Gate onto the field.
1 Virtual World Mai-Hime - Lulu
Virtual World Mai-Hime - Lulu is the only traditional Tuner that Virtual World has access to, and it's also the reason Virtual World is as good of a deck that it is. It has the Virtual World effect to special summon itself by sending a Virtual World card to the Graveyard, but has the best effect when it's summoned this way.
When Virtual World Mai-Hime - Lulu summons itself with its own effect, you can add a Virtual World card from your deck to your hand. It is the primary searcher for the deck, which allows you to then proceed into your main Synchro and Xyz plays.