the scryfall API wants to know who is using it

[Valur2000]

the scryfall API sometimes stops generic requests and wants some form of identification (not a full key just an identifier)

adding a few lines to the code worked for me:

const HEADER_OPTIONS = {
    "method": "get",
    "headers": {
      // 1. Name of your project / version
      // 2. A way to contact you (highly recommended for "good citizenship")
      "User-Agent": "MyMtgProject/1.0 (Contact: yourname@example.com)",
      
      // Scryfall specifically asks for this header
      "Accept": "application/json"
    },
      // Good for debugging option
    "muteHttpExceptions": true
  };

then change:

response = JSON.parse(UrlFetchApp.fetch(`${scryfall_url}&page=${page}`).getContentText());

into:

response = JSON.parse(UrlFetchApp.fetch(`${scryfall_url}&page=${page}`,HEADER_OPTIONS).getContentText());

[brandenon]

Yep, not sure how recent the change is but the Scryfall API now requires the User-Agent and Accept headers to return values: https://scryfall.com/docs/api. The code as-is would only return an error 400 request for me! Thanks.