TCG Card Shop Simulator: How to Build a Deck at the Workbench

The v1.0 update turns the Tetramon cards sitting in your album into something you can actually play, and the whole deck builder lives inside one piece of furniture. No menu on the phone, no separate tab in your collection screen. If the Workbench is not on your shop floor, deck building simply is not available to you yet.

Quick answer: Buy the Workbench for $1,000.00 from the My DIY Racks app, place it in your shop, interact with it, choose Deck Edit, then right-click cards in your album until the deck holds exactly 50.

Buy the Workbench from the My DIY Racks app

Open your in-game phone and launch the My DIY Racks app, the same storefront you use for shelves and racks. Scroll the product listing until you reach the Workbench entry.

In-game phone showing shop renovation options with Shop Lot B selected — The phone handles shop purchases and upgrades, including the Retail Shop Renovation screen with Shop Lot B selected. Image: OPNeon Games

Buy the Workbench for $1,000.00 and place it somewhere with room to stand in front of it. A green outline confirms a valid placement spot while you are positioning it.

Walk up to the placed Workbench and interact with it. The menu that opens has four options, and deck building is only one of them.

Rulebook — the full Tetramon Duel Master rules
Deck Edit — create and edit your custom decks
Bundle Cards — pack spare cards into bulk boxes
Back — close the menu

Add cards to a deck in the Deck Edit menu

Pick Deck Edit from the Workbench menu. You land on the Deck List, which holds your saved decks and empty slots for new ones. Hit Edit on Deck 1 to start.

Deck List screen showing Deck 1 with an Edit button and an empty deck slot — The Deck List, with Deck 1 flagged by a warning icon and an empty slot marked by a plus sign for a second deck. Image: OPNeon Games

Open your card album from inside the Deck Edit screen. This is your live collection, so anything you have pulled and kept is selectable here, from commons up to Full Art Rare and Gold Edition Legendary pulls.

Right-click a card to bring up the quantity selector, then confirm how many copies you want in the deck. Left-clicking only zooms in on the card for a closer look and adds nothing, which is the single most common reason a deck stays empty.

Deck Edit screen with the Gannon card selected and two cards already in Deck 1 — The Deck Edit screen mid-build, with the Gannon card selected and two cards already slotted into Deck 1. Image: OPNeon Games

Keep adding until the deck reaches 50. Each card entry shows its value and how many copies you own in the album, so you can see at a glance whether you are burning a $72.76 Full Art Rare on a casual build. Remove All clears a card out if you change your mind.

Card album open during deck building with card values and album counts listed

Deck construction limits

Rule	Limit
Deck size	Exactly 50 cards
Copies of the same card name	4 maximum
Workbench cost	$1,000.00
Decks you can keep	Multiple (Deck 1, Deck 2, and so on)

Try to push a fifth copy of a card into the list and the game blocks it with an “Only 4 card duplicates allowed” message. The cap counts card names, so owning 101 copies of a Jacktern in your album changes nothing.

Change the deck box and playmat

Cosmetics live behind the Others button in the Deck Edit menu. From there you can recolor the deck box and pick the game pad, which is the playmat your cards sit on during a duel. None of it touches deck legality, so you can change either one after the 50 cards are locked in.

Deck box and game pad customization options inside the Deck Edit menu

Save the deck and confirm it is usable

Press Done to save, which drops you back on the Deck List. The list gives every deck the same set of controls: Edit, Use, Copy, Paste, Delete, and Close. Use is the one that matters, because it marks a deck as your active one.

Here is your verification. Select Use on a finished deck and it is set as active with no complaint. Select Use on a deck that is short of 50 cards and the game throws a “Deck is in complete.” warning and refuses. If you see that message, go back into Deck Edit and keep adding cards.

Copy and Paste let you clone a finished 50-card list into a second slot, so you can test a variant without rebuilding the shared core card by card.

What the Tetramon Duel Master rulebook expects from your 50 cards

The Rulebook option on the Workbench spells out why the builder enforces those numbers. The setup for a duel runs like this:

Shuffle the 50-card deck and place it in your Deck Area
Draw an opening hand of 5 cards
One mulligan allowed: hand goes to the bottom, draw 5 fresh, then reshuffle
Place the top 4 cards face-down in your Guardian Area
Both players start on 500 Tamer Points

Four of your 50 cards are gone before the first turn, sitting face-down as Guardians, and you only see 5 more at the start. That is the practical argument for the 4-copy cap doing real work in your list: the cards you most want to draw are the ones you should be running four of.

Once Deck 1 accepts the Use command without a warning, the build side of Tetramon Duel Master is finished, and everything after that happens at the table.