You can search for cards by name with “name:” or by simply entering the words you want to find. By default, each word will be treated as a separate search token. Enclosing the string in quotes will cause it to be treated as a single token.
Use “region:” or “r:” to search by region. You can use the full name of the region or various short forms, such as the official 2-character codes (BW, DE, FR, IO, MT, NX, PZ, SI) or other abbreviated versions (“Targon”, “P&Z”, “Isles”).
Use “keyword:”, “kw:”, or “k:” to search for cards with specific keywords. This will include cards printed with the keyword, but won’t find cards that only mention that keyword in their descriptions.
Use “attack:”, “health:”, or “cost:” to search for cards by their numeric qualities. You can also use other numeric operators to find (for example) cards whose power is greater or less than a certain value. Querying for attack or health will only return cards which are units (followers or champions).