Mathmech

Master V from
MoriMorpho
on August 7th, 2025
cp-ur 630 + cp-sr 450
42 cards
Effect Veiler
2 copies
Droll & Lock Bird
Dotscaper
2 copies
Maxx "C"
3 copies
Ash Blossom & Joyous Spring
Firewall Guardian
Mathmech Addition
Mathmech Multiplication
Mathmech Sigma
2 copies
Mathmech Subtraction
2 copies
Mathmech Diameter
3 copies
Mathmech Circular
3 copies
Firewall Defenser
2 copies
Artifact Lancea
2 copies
Parallel eXceed
Gatchiri @Ignister
Nibiru, the Primal Being
2 copies
Cynet Mining
Mathmech Equation
Triple Tactics Talent
Triple Tactics Thrust
Book of Eclipse
2 copies
Called by the Grave
Crossout Designator
3 copies
Infinite Impermanence
Mathmech Superfactorial
Cyberse Desavewurm
Enigmaster Packbit
2 copies
Primathmech Laplacian
Primathmech Alembertian
Salamangreat Almiraj
Linguriboh
Link Decoder
2 copies
Splash Mage
G Golem Crystal Heart
Transcode Talker
Decode Talker Heatsoul
Accesscode Talker
Firewall Dragon Darkfluid - Neo Tempest Terahertz

Prerequisites

  • A registered Konami ID linked to your master duel game
  • Must login to Yu-Gi-Oh! Cards DB using the same Konami ID
  • If the Yu-Gi-Oh! DB website asks to login with Game Card ID just click "I don't have a game card ID" and fill some basic information to proceed

Export Guide

- Via the MDM extension (Recommended): Download on Firefox, or Chromium Browsers
For Chromium browsers (Chrome/Edge/Opera/Brave...etc) just click "Add to chrome" on the store page and it'll work on most if not all chromium browsers.
After using the extension, go to the Master Duel game => Main menu => Deck option => The Card database option at the top right corner => locate the deck you exported and copy it
Don't show this again
- Manually
  1. Click here to copy the export code
    2.
  2. Go to Yu-Gi-Oh! Cards DB and click My Deck => Add a Deck
  3. Once the deck page loads click Edit then do one of the following based on the platform your device is running:
    • (PC Only): Press F12 to open the DevTools window => Navigate to the Console tab in the window => Paste the export code => Hit Enter
    • OR (Other platforms/PC): In the address bar of the current tab remove the URL and type "javascript:" without the quotations then paste the export code, then if you're on mobile look for the *globe* icon and tap on it to run the code (Chrome only), for PC users just hit enter.
  4. The deck will save automatically
  5. Go to the Master Duel game => Main menu => Deck option => The Card database option at the top right corner => locate the deck you exported and copy it

Click here for a more detailed guide

Notes & Combos

Hi! I am happy to say that Mathmech has done it again, completely carrying me to Master V!

Compared to last season's decklist, the main deck has been altered slightly. Because I am conflicted on non-engine, I decided to run a 2:2 split between Droll and Lock Bird and Artifact Lancea for the best two decks of the format: Ryzeal and Maliss (respectively), replacing two D.D. Crows and one Lancea.

Additionally, I run more methods of extension, namely Mathmech Subtraction and Gatchiri @ignister, which serve different niches. Besides being an additional Mathmech name, level 4, and link material, Subtraction can help go for lethal lines with its effect. Another neat thing is that it can shut off a two-negate Apollousa, though it more often will force out their negate. Gatchiri, while not being searchable off of Cynet Mining, can increase the deck's ceiling if drawn, and is by no means a bad card in hand. It virtually makes our endboard boss monster, Firewall Dragon - Neo Tempest Terahertz a towers-esque monster that is also immune to strong boardbreakers such as Super Polymerization and Ultimate Slayer, which are seeing more play due to Ryzeal's popularity.

My personal MVP for my decklist variant are the two copies of Primathmech Laplacian. The abilty to take away your opponent's card in hand twice in some combos (one in our turn and their turn) is incredibly powerful, while also being a great tool of removal (non-target "send"), which can bypass effects such as the recent Ryzeal Detonator. Of course, Mathmech Diameter's omni negate is very strong.

While I never de-ranked, Diamond Rank 2 saw a very frustrating back-and-forth winning and losing. If Ryzeal establishes their endboard, it devastates us, inhibiting vital effects such as our Circular search, Parallel eXceed, and more. Thus, I experimented with some boardbreakers such as Triple Tactics Thrust and Book of Eclipse, but they never exactly showed up when I needed them. I'll continue to experiment as I play more.

Overall, this climb was alright! It was filled with some highs and lows, but that's expected in a ranked system like Master Duel's. Mathmech seems to still be a pretty viable deck, especially since it isn't affected by cards such as Artifact Lancea. While Droll and Lock Bird can be frustrating sometimes, we can still make a Terahertz board. However, we often really struggle going second without the right non-engine pieces.

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