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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I would assume it's not a class hierarchy but more lile Entity-Component-System (see eg ECS FAQ).
I had a class in university where we had to code a bot for Hearthstone. The code was modified from this repo. I know it's not YugiOh but it's also a card game with a lot of cards. As you can see in the repository, the cards themself are specified in an xml file and their basic effects (like summon, attack, ...) are implemented without specific values. Every card is "assembled" at runtime based on the specification and can be modified at runtime by adding or removing specific behaviours and stats.