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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 am only familiar with how an open source clone of hearthstone (https://github.com/jleclanche/fireplace) works since I built an evolutionary algorithm to beat the puzzle challenges, so I will speak to how I imagine MTGA implements their cards and rule engine.
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