🃏 MTG Wants - Cockatrice Deck Operations

A powerful Python CLI tool and library for performing arithmetic operations on Magic: The Gathering deck files in Cockatrice format (.cod). Perfect for deck management, inventory tracking, and wantslist generation for Cardmarket.

✨ Features

• 🔢 Deck Arithmetic: Add and subtract decks with --add and --sub operations
• 📦 Sideboard Support: Full support for sideboard management
• 🎯 Cardmarket Integration: Export formatted wantslists ready to paste into Cardmarket, automatically copied to clipboard
• 🔄 Sequential Operations: Chain multiple operations in exact order
• 📁 Cockatrice Compatible: Native support for Cockatrice .cod XML format
• 🐍 Python Library: Use as a CLI tool or import as a Python library

🎮 Use Cases

• Build a wantslist: Subtract your collection from a target deck to know what to buy
• Combine decks: Merge multiple decklists into one
• Track inventory: Keep your digital collection synchronized with physical cards
• Deck variations: Create deck variants by adding/removing specific cards
• Budget planning: Calculate exact cards needed for deck upgrades

📦 Installation

From PyPI (Coming Soon)

pip install mtgwants

From Source

git clone https://github.com/Firi0n/mtgwants.git
cd mtgwants
pip install -e .

📋 Requirements

• Python 3.10 or higher
• pyperclip (for clipboard support)

🚀 Quick Start

Basic Usage

# Save a single deck
mtgwants main.cod -o output.cod

# Create a wantslist: deck minus your collection
mtgwants deck.cod --sub collection.cod --print

# Combine multiple decks with sideboard
mtgwants deck1.cod --add deck2.cod --add deck3.cod --sideboard -o combined.cod

📖 Documentation

Command Line Interface

mtgwants MAIN_DECK [OPTIONS]

Required Arguments

• MAIN_DECK: The primary deck file in Cockatrice .cod format

Deck Operations

Option	Short	Description
--add DECK.COD	-a	Add cards from deck file (repeatable)
--sub DECK.COD	-b	Subtract cards from deck file (repeatable)

Important: Operations are executed in the exact order you specify them on the command line. Order matters because subtraction doesn't produce negative quantities.

Other Options

Option	Short	Description
--sideboard	-s	Include sideboard from all decks
--output FILE	-o	Save result to a .cod file
--print	-p	Print cardlist to console (Cardmarket format) and copy it to clipboard
--deck-name NAME	-n	Custom name for output deck (default: "Deck")
--verbose	-v	Verbose output (use -vv for extra detail)

Note: At least one of --output or --print must be specified.

📚 Examples

Example 1: Generate a Wantslist

You want to build a Commander deck but need to know which cards to buy:

mtgwants commander_deck.cod --sub my_collection.cod --sideboard --print

This outputs a formatted list and copies it directly to your clipboard, ready to paste into Cardmarket's wantslist.

Example 2: Combine Decklists

Merge several decklists into one master list:

mtgwants deck1.cod --add deck2.cod --add deck3.cod -o master_deck.cod

Example 3: Track Inventory

After buying cards, update your collection and recalculate what you still need:

mtgwants target_deck.cod --sub old_collection.cod --add new_cards.cod -o updated_needs.cod --print

Example 4: Short Form Syntax

Use abbreviated flags for quicker commands:

mtgwants main.cod -a extras.cod -b dupes.cod -o final.cod -p

Example 5: Order Matters

Operations are executed left-to-right in exact order:

# Add first, then subtract
mtgwants deck.cod --add new.cod --sub owned.cod -p
# Result: (deck + new) - owned

# Different order, different result
mtgwants deck.cod --sub owned.cod --add new.cod -p
# Result: (deck - owned) + new

Example 6: Debug with Verbose Output

See detailed information about each operation:

mtgwants main.cod -a extras.cod -b dupes.cod -o final.cod -vv

Output:

Loading main deck: main.cod
  Main: 60 cards
Adding: extras.cod
  Result main: 75 cards
Subtracting: dupes.cod
  Result main: 60 cards
Saving to: final.cod
✓ Saved successfully

✓ Operations completed successfully
Final deck: 60 cards in main

🐍 Python Library Usage

Use mtgwants as a library in your Python projects:

from mtgwants import Card, Zone, Deck, CockatriceParser

# Create parser
parser = CockatriceParser(sideboard=True)

# Load decks
deck1 = parser.load("deck1.cod")
deck2 = parser.load("deck2.cod")

# Perform operations
combined = deck1 + deck2
needs = deck1 - deck2

# Access card data
for card, quantity in combined.main.items():
    print(f"{quantity}x {card.name}")

# Save result
parser.save(combined, "output.cod", "My Combined Deck")

Core Classes

Card

Represents a Magic: The Gathering card identified by name.

card = Card("Lightning Bolt")
print(card.name)  # "Lightning Bolt"
print(card.is_basic_land)  # False

Zone

A multiset of cards with arithmetic operations (main deck, sideboard, etc.).

zone = Zone({Card("Lightning Bolt"): 4, Card("Counterspell"): 2})
print(len(zone))  # 6 (total cards)
print(zone.unique_cards)  # 2 (different cards)

Deck

Complete deck with main zone and optional sideboard.

main = Zone({Card("Lightning Bolt"): 4})
side = Zone({Card("Counterspell"): 2})
deck = Deck(main, side)

print(deck.has_sideboard)  # True
print(len(deck))  # 6 (main + sideboard)

# Get deck without basic lands
result = deck.nonland_deck
print(result.main_lands)   # number of basic lands removed from main
print(result.side_lands)   # number of basic lands removed from sideboard
print(result.deck)         # filtered Deck

ZoneType

Enum for specifying which zone to operate on.

from mtgwants import ZoneType

deck.get_count(Card("Lightning Bolt"), zone=ZoneType.MAIN)
deck.items(zone=ZoneType.SIDEBOARD)

CockatriceParser

Parser for reading and writing .cod files.

parser = CockatriceParser(sideboard=True)
deck = parser.load("deck.cod")
parser.save(deck, "output.cod", "Deck Name")

🛠️ Technical Details

File Format

Cockatrice .cod files are XML files with the following structure:

<?xml version="1.0"?>
<cockatrice_deck version="1">
    <deckname>My Deck</deckname>
    <comments></comments>
    <zone name="main">
        <card number="4" name="Lightning Bolt"/>
        <card number="2" name="Counterspell"/>
    </zone>
    <zone name="side">
        <card number="3" name="Negate"/>
    </zone>
</cockatrice_deck>

Cardmarket Export Format

The --print option generates output ready for Cardmarket's "Add a Deck List" feature, and automatically copies it to your clipboard:

4 Lightning Bolt
2 Counterspell

// Sideboard
3 Negate

Basic lands (Plains, Island, Swamp, Mountain, Forest, Wastes) are automatically excluded from the output.

After pasting into Cardmarket:

1. Select all cards → Edit
2. Set language, condition, and foil preferences
3. Save your wantslist

Arithmetic Operations

Operations follow mathematical rules:

• Addition: Combines card quantities

  deck1 = Zone({Card("Bolt"): 2})
  deck2 = Zone({Card("Bolt"): 2})
  result = deck1 + deck2  # {Card("Bolt"): 4}
  

• Subtraction: Removes cards (negatives become zero)

  deck = Zone({Card("Bolt"): 4})
  owned = Zone({Card("Bolt"): 2})
  needs = deck - owned  # {Card("Bolt"): 2}
  

• Sequential Operations: Processed in exact command-line order (left to right)

  mtgwants A.cod --add B.cod --sub C.cod --add D.cod
  # Equivalent to: (((A + B) - C) + D)
  

🤝 Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📝 License

This project is licensed under the MIT License - see the LICENSE file for details.

🎯 Roadmap

• Cardmarket API integration (when/if they finally release it to private users)

💡 FAQ

Q: Why "mtgwants"?
A: The tool was originally designed to generate wantslists for Cardmarket by subtracting your collection from target decks.

Q: Does this work with other MTG software?
A: Currently only Cockatrice .cod format is supported. Other formats are planned.

Q: What about the Cardmarket API?
A: Cardmarket's API v3.0 for private users has been "coming soon" since 2021. Until then, use the --print option for manual import.

Q: Can I use this in my own Python project?
A: Absolutely! Import the library and use the Card, Zone, ZoneType, Deck, and CockatriceParser classes.

Q: The clipboard copy didn't work.
A: On some Linux systems you may need to install a clipboard backend: sudo apt install xclip or sudo apt install xsel.

🙏 Acknowledgments

• Cockatrice - Open source MTG client
• Cardmarket - European MTG marketplace
• The Magic: The Gathering community

📞 Contact

• GitHub: @Firi0n
• Project Link: https://github.com/Firi0n/mtgwants

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⭐ If you find this tool useful, please consider giving it a star on GitHub!