Searches use the local catalog and remain limited by ECT card-pool restrictions and your selected filters. This is a supported subset of Scryfall syntax, not its entire search language. AND binds more tightly than OR. Use -(t:land OR t:artifact) to exclude a group. For c: (card color) and id: (color identity), :/>= includes all listed colors, = matches exactly, and <= allows only listed colors; </> excludes an exact match. Use c for colorless or a count such as id=2. ECT Cards supports the common operators shown here plus name:, c:, artist:, leader:, eligible:, and status:.
View Scryfall's full syntax reference