Mathmech

Master V from
pocofrosty12
on September 15th, 2025
cp-ur 750 + cp-sr 420
40 cards
Effect Veiler
3 copies
Droll & Lock Bird
Micro Coder
2 copies
Maxx "C"
3 copies
Ash Blossom & Joyous Spring
3 copies
Backup @Ignister
2 copies
Firewall Guardian
Mathmech Multiplication
Mathmech Sigma
Mathmech Subtraction
Mathmech Diameter
3 copies
Mathmech Circular
3 copies
Firewall Defenser
Mulcharmy Fuwalos
2 copies
Wizard @Ignister
Nibiru, the Primal Being
2 copies
A.I. Connect
Mathmech Equation
2 copies
Called by the Grave
Crossout Designator
3 copies
Infinite Impermanence
Mathmech Superfactorial
Cynet Conflict
Cyberse Desavewurm
Firewall Saber Dragon
Enigmaster Packbit
Primathmech Laplacian
Primathmech Alembertian
Allied Code Talker @Ignister
2 copies
Link Decoder
Cyberse Wicckid
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

Excited to post this as its my first time making Master! I gravitated towards mathmech, since it was similar to midrange-y decks I played in other TCGs. My list is really "inspired" (read stolen) by bajs' and Sofke's posts.

Inclusions
  • {Backup @Ignister}: Extender + Searcher. Usually you are adding {Wizard @Ignister} or {Firewall Defenser}. Don't forget that the search and SS effects are seperate, so drawing 2 in hand isn't terrible.
  • {Wizard @Ignister}: Another great extender that's only useful if you draw it alongside another card. I'm running 2 right now, but could easily see it at 1.
  • {A.I. Connect}: Great if you open this card with {Backup @Ignister} and {Firewall Defenser}, since it special summons and searches for {Mathmech Circular}. You run a lot of dark targets in this deck, so usually isn't a brick in hand.
  • {Firewall Saber Dragon}: Very solid card helping search for {A.I. Connect} and combos with {Backup @Ignister} to add back the discard. Remember that {Mathmech Sigma} and {Mathmech Diameter} are actually tuners, so can't synchro with them. Since I only run one copy of {Mathmech Laplacian}, in certain hands, you can summon it, then add it back for superfactorial on the opponent's turn to hand rip 2 cards.
  • {Firewall Dragon Darkfluid - Neo Tempest Terahertz}: Besides being your main OTK, can help play through a LOT of weird situations if you get interrupted early in your combo. For example, sending {Mathmech Diameter} to get superfact online, {Firewall Defenser} for {Wizard @Ignister} target, {Micro Coder} to get reborn by {Splash Mage} for {Cynet Conflict}.
  • {Droll & Lock Bird}: You can shut off a lot of decks, including Ryzeal. Can sometimes let you play under {Maxx "C"}, if you drew the traps, but this comes up rarely.
  • {Firewall Guardian}: Played 2, cause you really don't wanna draw it if you play 1
Cut Cards
  • {Cynet Mining}: Decided to cut this card, since going -1 if you get Ash Blossomed is really bad.
  • {Artifact Lancea}: Targeted Maliss hate, which plagues the ladder, but not important into anything else. Can be completely dead sometimes, since using it turns off your {Cynet Conflict} and {Allied Code Talker @Ignister}.
  • {Salamangreat Almiraj}: Only comes up if you open a hand heavy in handtraps and makes you 1 {Backup @Ignister} hands slightly better. Since I'm not playing {Parallel eXceed}, I cut it.

Shoutouts to the #mathmech channel, its pins, and the MDM written guide! Great info in there on combos.

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