Duelist Nexus, a set that was released on July 28, 2023 in NA, isn't the most impactful competitive set, but it gives many lesser-used decks a boost in viability. However, there are a few generic cards that may be used in future decks.

Potentially Viable Generic Cards

Revolution Synchron joins the long list of Tuner monsters that contribute to high-tempo plays. Being a level 3 Tuner is even more fortuitous, as making a Level 7 Synchro for its secondary effect is made effortless with the sheer amount of Level 4 non-tuners in most decks. 

Sleipnir the Runick Mane is an odd addition to the Runick engine. Its high level, as well as its naturally disruptive effect, separates it from the usual consistency or recovery-adjacent Runick theme. Sleipnir's removal effect adds a layer of complexity to breaking Runick boards, which now have access to both the steed and the Spells' initial effects. Being level 9 may be useful in the future, either for XYZ or Synchro summons.

Tokusano Shinkyojin seems, at first glance, akin to Trade-In and Kuji-Kiri Curse. But Shinkyojin is unique in that players can combine the levels of the monsters sent, in exchange for its requirement being a tad higher. Decks with tons of level 10 monsters may want the boost in consistency, but as always with cards that send for cost, it may fall prey to Ash Blossom & Joyous Spring too much to be relevant.

Just an Illusion

DUNE introduces the new Illusion type! Illusion monsters like Cornfield Coatl and Mirror Swordknight typically have effects that prevent monsters from being destroyed by battle, representative of their unreal nature. As of their debut, they are more akin to Mythical Beast support, culminating in their boss monster, Chimera the Illusion Beast. While they are not great at the moment, both Psychic and Wyrm type rose up in their respective times to terrorize the competitive circuit. 

The Legend Continues

The Infernoble Knight deck has always teetered on the edge of competitive viability. Their consistency and power even got Smoke Grenade of the Thief forbidden! But their effects necessitate the use of Equip spells, which aren't typically the best at breaking boards. Will their new tools give them the power they need, or is it more of the same?

Infernoble Knight Ricciardetto is a slightly different flavor of extender in that it can either increase your tempo via dropping a Warrior off onto the battlefield, or go for a powerplay with itself and a newly revived monster. 

Emperor Charles the Great is a unique Link monster - typically, Link 1's are the weakest. This lies in its summon condition, essentially becoming an upgrade to Infernoble Knight Emperor Charles. It is dubious on whether having a stronger opening board is what Infernoble Knight would benefit most from, having a more direct disruption isn't something the deck will complain about. In the same vein, Angelica, Princess of Noble Arms adds a level of intricacy by introducing Horn of Olifant to the mix, a searchable trap disruption.

Infernoble Knight also gains massive consistency from "Infernoble Arms - Almace" and Noble Arms Museum. It's debatable whether the deck lacked inherent consistency or if the amount of Equip spells leads to more bricks.

The Next Step in Evolution

The Evol archetype is tame as a deck and often gets their XYZ boss monsters such as Evolzar Laggia stolen by other Dinosaur decks. At the least, Evoltile Pholis and Evolsaur Lios branch the Evols together by providing search capabilities for their best card, Evo-Singularity. By extension, the generic Evolzar Lars becomes a more realistic possibility. While any deck can make this omni-negate, Dinosaur decks can get two disruptions by simply playing how they are intended.

An Altered Gameplan

Altergeist has long been out of fashion in favor of other trap decks such as Labrynth. Perhaps a new plan is what the deck requires? At least, that's what the designs of Altergeist Peritrator and Altergeist Malwisp suggest. The former can gather materials by sending Altergeist Pookuery, while the latter simply summons bodies. 

The result of all these monsters culminates in Altergeist Adminia. This boss monsters recognizes the origins of Altergeist by setting a Trap - likely Altergeist Protocol. Its disruptive effect is flavorful, showcasing their tricky, alien-like abilities by taking over an opponent's monster and converting them into an Altergeist. Unfortunately, by way of pivoting rather late into the deck's conception, it lacks cohesion.

Help! It's an EMERGENCY!

EMERGENCY! is an impressive take on the time-old "recruiter" staple Spell. Not only does EMERGENCY! fetch Rescue-ACE Hydrant and thus connect to any other Rescue-ACE monster, but it recycles EXTINGUISH! as well. Along with ALERT! and Rescue-ACE Air Lifter, Rescue-Ace is hitting high levels of consistency. To complement this, Rescue-ACE Preventer is one of the easiest Rescue-ACE monsters to summon! Preventer ironically excels at busting down established boards with its flipping effect and high Attack. It pulls double duty as an extender or a grind tool by bringing back the likes of Rescue-ACE Air Lifter and Hydrant. 

New Worlds, Old Faces

Mannadium Torrid joins Mannadium Fearless and Mannadium Meek to increase the Mannadium deck's consistency. Unlike the other two, Torrid can tutor out Mannadium monsters other than itself, leading to more diversity in its plays. Visas Amritara offers a lower-Level alternative to Mannadium Prime-Heart, with a more grind-heavy effect. It can search a multitude of Spells or Traps, so Amritara may make its appearance in other decks. Being a Tuner itself, it can even combo into the aforementioned Prime-Heart!

Smaller Additions

Some decks have only received one or two cards. It would be remiss not to mention Epurrely Noir! The Purrely deck was presumed unplayable due to a recent ban list, but its going-second build has proven the cuddly creatures can still brawl. Almost to align with this new focus, Epurrely Noir can clear the opponent's board with a two-for-one trade.

Dark Corridor, like many cards in Duelist Nexus, provides consistency for Dark World while potentially activating the effects of Grapha, Dragon Lord of Dark World and friends. However, like Infernoble Knights, it's questionable whether Dark World benefits the most from additional consistency pieces when the deck is already fraught with draw and search power.

Finally, Arahime the Manifested Mikanko follows the trend that Ohime the Manifested Mikanko set by providing a utility effect despite being a Ritual monster. While Ohime provides consistency, Arahime leans into the trend of Equip spells. Its effect is slow, but Mikanko needs Ritual monsters anyways, so it will likely find a place in the deck nonetheless.

Conclusion

Duelist Nexus raises many existing decks to a playable level. Keep its generic cards in mind for future archetypes, and definitely watch out for Rescue-ACE!