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    Are the decks actually stored in plain text format? My napkin math would be:

    How many magic cards are there? 20 years times 2 expansions times 400 cards (been a while so maybe I’m 100% off), but maybe an upper bound of 32k (for now), that’s a not very big integer

    100 (cards) x an id (int).

    Should be enough to materialize the decks on display/export. Or maybe I am missing something because I found it a little hard to read. Also many people will probably have a certain FOTM deck, so maybe 5-10% could actually be just a reference to a predefined deck list.