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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.
That said, if you really want better legitimate options, go play MTG Forge! It supports every major format under the sun, has 2 dedicated RPG modes and the ability to run against gauntlets of decks. You could probably import all the Duels 2015 decks there, find a Duels 2015-esque skin, and enjoy the meta of that game that way.
NOTE:
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Hence, a higher number means a more popular project.