Magic The Gathering Game Information.
Magic The Gathering API is a free Games & Comics API that requires no API key, is only available over HTTP and has unconfirmed CORS support.
The ultimate Magic: The Gathering developer resource. The MTG API allows developers to easily consume MTG card and set data in JSON format.
Details from magicthegathering.io.

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The Magic The Gathering API is provided by Magic The Gathering API (magicthegathering.io). The ultimate Magic: The Gathering developer resource. The MTG API allows developers to easily consume MTG card and set data in JSON format.
Yes. The Magic The Gathering API is listed in the Games & Comics category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Magic The Gathering API requires no authentication, so you can start making requests without signing up.
CORS support for the Magic The Gathering API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
No. The Magic The Gathering API is only available over plain HTTP, which browsers block on HTTPS sites. Call it from a server instead.