NEXUS

Executive Summary

The Firewall archetype is a combo-centric Cyberse strategy focused on "Link Climbing"?using monsters to summon increasingly powerful Link Monsters. The deck's core identity revolves around its Main Deck monsters, which generate significant advantage when used as Link Material, creating a recursive loop that fuels extensive combos. The ultimate goal is to summon the high-Link "Firewall Dragon" bosses, whose powers scale based on the variety of monster types in the Graveyard. It rarely operates alone, functioning as a powerful engine within broader Cyberse strategies like Code Talker and Mathmech.

Core Main Deck Engine

Firewall Defenser

The premier one-card starter. When sent to the GY for a Cyberse Link Summon, it Special Summons another "Firewall" monster directly from your Deck, igniting your entire combo chain.

Firewall Phantom

The resource architect. When used as Link Material, it searches any "Cynet" Spell/Trap, giving you access to powerful extenders like Cynet Codec or protection like Cynet Conflict.

Firewall Guardian

A free resource for Link climbing. When sent to the GY as Link Material, it refuses to be Earthbound, Special Summoning itself back to provide an extra body for further summons.

Core Combo: The Defenser Starter

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Firewall Defenser
Missing: 20455229
1

Initiate Protocol

Normal Summon Firewall Defenser. Use it to Link Summon Salamangreat Balelynx. This triggers Defenser's effect in the GY.

Firewall Phantom
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2

Generate Advantage

Defenser's effect resolves, Special Summoning Firewall Phantom from the Deck. Now you have two monsters on board from one card.

Cynet Codec
Missing: 60018643
3

Access the Network

Use Balelynx and Phantom to Link Summon a Link-2 monster (e.g., Splash Mage - currently banned; use Aromaseraphy Jasmine as a legal alternative). Phantom's GY effect now triggers, allowing you to search for Cynet Codec and start the resource loop.

The Final Bastion: Ideal End Board

Firewall Dragon Singularity
Missing: 21637210

A Multi-Layered Defense

A successful combo culminates in an oppressive board designed to dismantle the opponent's turn. The centerpiece is Firewall Dragon Singularity, supported by various forms of interaction.

  • Multiple Bounces: Singularity can return multiple cards your opponent controls to the hand as a Quick Effect.
  • Monster Negates: Firewall Dragon Darkfluid can provide multiple monster effect negations.
  • Omni-Negation: A set Cynet Conflict provides a powerful Counter Trap to negate any card or effect.
  • GY & Hand Disruption: The Mathmech engine adds Mathmech Superfactorial, which can remove threats from the field, GY, and hand.

Strategic Analysis

Strengths

  • Extremely High Ceiling: Can produce one of the most oppressive end boards in the game.
  • Mid-Combo Resilience: Cynet Codec generates enough resources to play through multiple interruptions.
  • Powerful OTK Potential: Boss monsters like Neo Tempest Terahertz can end the game in a single Battle Phase.

Weaknesses

  • Fragile Choke Points: Vulnerable to specific hand traps like Droll & Lock Bird and Nibiru.
  • High Complexity: Long, non-linear combo lines demand significant pilot skill and matchup knowledge.
  • Engine Requirements: Can draw inconsistent hands due to the need for multiple engines and one-of combo pieces.

Forging Alliances

  • Code Talker Engine: A mandatory pairing. Required to activate Cynet Codec and generate the resources needed to Link climb.
  • Mathmech Engine: The most competitive framework, offering a more resilient starter (Mathmech Circular) and additional disruption.

Live TCG Banlist Status

Banlist Impact

Fully Unrestricted

The Firewall archetype, with its Link-based Cyberse strategy with bouncing and swarming effects, operates at full power with no restrictions on the current TCG banlist.

Maximum Consistency

Play any card at your preferred ratio without restrictions

Full Strength Plays

Access to all archetype synergies without limitations

Strategic Freedom

No banlist constraints holding back your strategy

Banlist Status Summary

+ analyzed • 0 restrictions found • All cards legal at 3 copies