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But then

We also buy really large collections: If the value of your collection exceeds 20,000, we will look for an individual solution with you, for example we will be happy to come to you or you can come to Vienna at our expense

Last week we got Jeskai, Sultai, and Mardu, and this week were kicking things off with Abzan

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The author realized that focusing on a single game allowed him to have more story focus, and so it became the focus of long story arcs in the manga, became the central focus of the anime, and snowballed until the entire franchise centers around it to the point where non-card games are very rare