It's based off of desktop apps like Magic Suitcase which store your card collections and allow you to search through your inventory. .
Using custom post types and taxonomies, you can store information about your cards, sort them by series, and split them into collections.
Collections could be based on whatever criteria you like — some examples could be to split them by game, decks, etc..
This was just sideproject of mine, but it's based off of I used when I was collecting Magic Gathering cards actively.
This plugin will always be free, which means I'm not making any money off of it, and therefore may or may not be inclined to add new features to it.
However, given enough interest, there are few directions this plugin could go like..
Game-based extensions that add new features and game-centric icons that replace the text that displays for casting summoning cost or series..
Each extension will have some kind of bounty based on how long it would take to develop it.
I'll try to throw together some kind of Kickstarter-like donation system, so people can donate toward particular goal and if enough people donate, the add-on gets made..
For now you can either open in GitHub issue tracker or ping me on Twitter...
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